diff --git a/Makefile b/Makefile
index 6a19d057f5..9d326895fa 100644
--- a/Makefile
+++ b/Makefile
@@ -67,6 +67,7 @@ REVIEWDOG_VERSION         := $(eval REVIEWDOG_VERSION := $(shell cat versions/RE
 TELEPRESENCE_VERSION      := $(eval TELEPRESENCE_VERSION := $(shell cat versions/TELEPRESENCE_VERSION))$(TELEPRESENCE_VERSION)
 VALDCLI_VERSION           := $(eval VALDCLI_VERSION := $(shell cat versions/VALDCLI_VERSION))$(VALDCLI_VERSION)
 YQ_VERSION                := $(eval YQ_VERSION := $(shell cat versions/YQ_VERSION))$(YQ_VERSION)
+BUF_VERSION               := $(eval BUF_VERSION := $(shell cat versions/BUF_VERSION))$(BUF_VERSION)
 
 OTEL_OPERATOR_RELEASE_NAME ?= opentelemetry-operator
 PROMETHEUS_RELEASE_NAME    ?= prometheus
@@ -396,7 +397,8 @@ format: \
 	format/go \
 	format/json \
 	format/md \
-	format/yaml
+	format/yaml \
+	format/proto
 
 .PHONY: format/go
 ## run golines, gofumpt, goimports for all go files
@@ -448,6 +450,11 @@ format/json: \
 	    "charts/**/*.json" \
 	    "hack/**/*.json"
 
+.PHONY: format/proto
+format/proto: \
+	buf/install
+	buf format -w
+
 .PHONY: deps
 ## resolve dependencies
 deps: \
diff --git a/Makefile.d/tools.mk b/Makefile.d/tools.mk
index 95e59b58f5..ed71eaf1a1 100644
--- a/Makefile.d/tools.mk
+++ b/Makefile.d/tools.mk
@@ -83,3 +83,12 @@ textlint/install:
 textlint/ci/install:
 	npm init -y
 	npm install --save-dev textlint textlint-rule-en-spell textlint-rule-prh textlint-rule-write-good
+
+.PHONY: buf/install
+buf/install: $(BINDIR)/buf
+
+$(BINDIR)/buf:
+	curl -sSL \
+	"https://github.com/bufbuild/buf/releases/download/$(BUF_VERSION)/buf-$(shell uname -s)-$(shell uname -m)" \
+	-o "${BINDIR}/buf" && \
+	chmod +x "${BINDIR}/buf"
diff --git a/apis/proto/v1/agent/core/agent.proto b/apis/proto/v1/agent/core/agent.proto
index 59c2fcebdf..b2142e8519 100644
--- a/apis/proto/v1/agent/core/agent.proto
+++ b/apis/proto/v1/agent/core/agent.proto
@@ -23,15 +23,13 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/agent/core";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.agent.core";
 option java_outer_classname = "ValdAgent";
+option java_package = "org.vdaas.vald.api.v1.agent.core";
 
 // Represent the agent service.
 service Agent {
-
   // Represent the creating index RPC.
-  rpc CreateIndex(payload.v1.Control.CreateIndexRequest)
-      returns (payload.v1.Empty) {
+  rpc CreateIndex(payload.v1.Control.CreateIndexRequest) returns (payload.v1.Empty) {
     option (google.api.http).get = "/index/create";
   }
 
@@ -41,8 +39,7 @@ service Agent {
   }
 
   // Represent the creating and saving index RPC.
-  rpc CreateAndSaveIndex(payload.v1.Control.CreateIndexRequest)
-      returns (payload.v1.Empty) {
+  rpc CreateAndSaveIndex(payload.v1.Control.CreateIndexRequest) returns (payload.v1.Empty) {
     option (google.api.http).get = "/index/createandsave";
   }
 
diff --git a/apis/proto/v1/agent/sidecar/sidecar.proto b/apis/proto/v1/agent/sidecar/sidecar.proto
index 40a6b6e2d6..878de7d9d6 100644
--- a/apis/proto/v1/agent/sidecar/sidecar.proto
+++ b/apis/proto/v1/agent/sidecar/sidecar.proto
@@ -20,8 +20,8 @@ package sidecar.v1;
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/agent/sidecar";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.agent.sidecar";
 option java_outer_classname = "ValdAgentSidecar";
+option java_package = "org.vdaas.vald.api.v1.agent.sidecar";
 
 // Represent the agent sidecar service.
 service Sidecar {}
diff --git a/apis/proto/v1/discoverer/discoverer.proto b/apis/proto/v1/discoverer/discoverer.proto
index 62fa2ad4c7..76d9c44539 100644
--- a/apis/proto/v1/discoverer/discoverer.proto
+++ b/apis/proto/v1/discoverer/discoverer.proto
@@ -23,25 +23,24 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/discoverer";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.discoverer";
 option java_outer_classname = "ValdDiscoverer";
+option java_package = "org.vdaas.vald.api.v1.discoverer";
 
 // Represent the discoverer service.
 service Discoverer {
-
   // Represent the RPC to get the agent pods information.
   rpc Pods(payload.v1.Discoverer.Request) returns (payload.v1.Info.Pods) {
     option (google.api.http) = {
-      post : "/discover/pods"
-      body : "*"
+      post: "/discover/pods"
+      body: "*"
     };
   }
 
   // Represent the RPC to get the node information.
   rpc Nodes(payload.v1.Discoverer.Request) returns (payload.v1.Info.Nodes) {
     option (google.api.http) = {
-      post : "/discover/nodes"
-      body : "*"
+      post: "/discover/nodes"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/filter/egress/egress_filter.proto b/apis/proto/v1/filter/egress/egress_filter.proto
index 5681ea62fb..72ab957d4c 100644
--- a/apis/proto/v1/filter/egress/egress_filter.proto
+++ b/apis/proto/v1/filter/egress/egress_filter.proto
@@ -23,27 +23,24 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/filter/egress";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.filter.egress";
 option java_outer_classname = "ValdEgressFilter";
+option java_package = "org.vdaas.vald.api.v1.filter.egress";
 
 // Represent the egress filter service.
 service Filter {
-
   // Represent the RPC to filter the distance.
-  rpc FilterDistance(payload.v1.Object.Distance)
-      returns (payload.v1.Object.Distance) {
+  rpc FilterDistance(payload.v1.Object.Distance) returns (payload.v1.Object.Distance) {
     option (google.api.http) = {
-      post : "/filter/egress/distance"
-      body : "*"
+      post: "/filter/egress/distance"
+      body: "*"
     };
   }
 
   // Represent the RPC to filter the vector.
-  rpc FilterVector(payload.v1.Object.Vector)
-      returns (payload.v1.Object.Vector) {
+  rpc FilterVector(payload.v1.Object.Vector) returns (payload.v1.Object.Vector) {
     option (google.api.http) = {
-      post : "/filter/egress/vector"
-      body : "*"
+      post: "/filter/egress/vector"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/filter/ingress/ingress_filter.proto b/apis/proto/v1/filter/ingress/ingress_filter.proto
index 871ed1bcff..07fb381f22 100644
--- a/apis/proto/v1/filter/ingress/ingress_filter.proto
+++ b/apis/proto/v1/filter/ingress/ingress_filter.proto
@@ -23,26 +23,24 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/filter/ingress";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.filter.ingress";
 option java_outer_classname = "ValdIngressFilter";
+option java_package = "org.vdaas.vald.api.v1.filter.ingress";
 
 // Represent the ingress filter service.
 service Filter {
-
   // Represent the RPC to generate the vector.
   rpc GenVector(payload.v1.Object.Blob) returns (payload.v1.Object.Vector) {
     option (google.api.http) = {
-      post : "/filter/ingress/object"
-      body : "*"
+      post: "/filter/ingress/object"
+      body: "*"
     };
   }
 
   // Represent the RPC to filter the vector.
-  rpc FilterVector(payload.v1.Object.Vector)
-      returns (payload.v1.Object.Vector) {
+  rpc FilterVector(payload.v1.Object.Vector) returns (payload.v1.Object.Vector) {
     option (google.api.http) = {
-      post : "/filter/ingress/vector"
-      body : "*"
+      post: "/filter/ingress/vector"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/manager/index/index_manager.proto b/apis/proto/v1/manager/index/index_manager.proto
index cc33bd0ca3..40a1679d6b 100644
--- a/apis/proto/v1/manager/index/index_manager.proto
+++ b/apis/proto/v1/manager/index/index_manager.proto
@@ -23,12 +23,11 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/manager/index";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.manager.index";
 option java_outer_classname = "ValdIndexManager";
+option java_package = "org.vdaas.vald.api.v1.manager.index";
 
 // Represent the index manager service.
 service Index {
-
   // Represent the RPC to get the index information.
   rpc IndexInfo(payload.v1.Empty) returns (payload.v1.Info.Index.Count) {
     option (google.api.http).get = "/index/info";
diff --git a/apis/proto/v1/payload/payload.proto b/apis/proto/v1/payload/payload.proto
index a23954ba1d..d2b9bd2285 100644
--- a/apis/proto/v1/payload/payload.proto
+++ b/apis/proto/v1/payload/payload.proto
@@ -23,15 +23,15 @@ import "github.com/googleapis/googleapis/google/rpc/status.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/payload";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.payload";
 option java_outer_classname = "ValdPayload";
+option java_package = "org.vdaas.vald.api.v1.payload";
 
 // Search related messages.
 message Search {
   // Represent a search request.
   message Request {
     // The vector to be searched.
-    repeated float vector = 1 [ (validate.rules).repeated .min_items = 2 ];
+    repeated float vector = 1 [(validate.rules).repeated.min_items = 2];
     // The configuration of the search request.
     Config config = 2;
   }
@@ -77,7 +77,7 @@ message Search {
     // Unique request ID.
     string request_id = 1;
     // Maximum number of result to be returned.
-    uint32 num = 2 [ (validate.rules).uint32.gte = 1 ];
+    uint32 num = 2 [(validate.rules).uint32.gte = 1];
     // Search radius.
     float radius = 3;
     // Search coefficient.
@@ -89,7 +89,7 @@ message Search {
     // Egress filter configurations.
     Filter.Config egress_filters = 7;
     // Minimum number of result to be returned.
-    uint32 min_num = 8 [ (validate.rules).uint32.gte = 0 ];
+    uint32 min_num = 8 [(validate.rules).uint32.gte = 0];
     // Aggregation Algorithm
     AggregationAlgorithm aggregation_algorithm = 9;
   }
@@ -147,11 +147,10 @@ message Filter {
 
 // Insert related messages.
 message Insert {
-
   // Represent the insert request.
   message Request {
     // The vector to be inserted.
-    Object.Vector vector = 1 [ (validate.rules).repeated .min_items = 2 ];
+    Object.Vector vector = 1 [(validate.rules).repeated.min_items = 2];
     // The configuration of the insert request.
     Config config = 2;
   }
@@ -194,7 +193,7 @@ message Update {
   // Represent the update request.
   message Request {
     // The vector to be updated.
-    Object.Vector vector = 1 [ (validate.rules).repeated .min_items = 2 ];
+    Object.Vector vector = 1 [(validate.rules).repeated.min_items = 2];
     // The configuration of the update request.
     Config config = 2;
   }
@@ -237,11 +236,10 @@ message Update {
 
 // Upsert related messages.
 message Upsert {
-
   // Represent the upsert request.
   message Request {
     // The vector to be upserted.
-    Object.Vector vector = 1 [ (validate.rules).repeated .min_items = 2 ];
+    Object.Vector vector = 1 [(validate.rules).repeated.min_items = 2];
     // The configuration of the upsert request.
     Config config = 2;
   }
@@ -284,7 +282,6 @@ message Upsert {
 
 // Remove related messages.
 message Remove {
-
   // Represent the remove request.
   message Request {
     // The object ID to be removed.
@@ -310,11 +307,10 @@ message Remove {
 
 // Common messages.
 message Object {
-
   // Represent a request to fetch raw vector.
   message VectorRequest {
     // The vector ID to be fetched.
-    ID id = 1 [ (validate.rules).repeated .min_items = 2 ];
+    ID id = 1 [(validate.rules).repeated.min_items = 2];
     // Filter configurations.
     Filter.Config filters = 2;
   }
@@ -338,21 +334,27 @@ message Object {
   }
 
   // Represent the vector ID.
-  message ID { string id = 1 [ (validate.rules).string.min_len = 1 ]; }
+  message ID {
+    string id = 1 [(validate.rules).string.min_len = 1];
+  }
 
   // Represent multiple vector IDs.
-  message IDs { repeated string ids = 1; }
+  message IDs {
+    repeated string ids = 1;
+  }
 
   // Represent a vector.
   message Vector {
     // The vector ID.
-    string id = 1 [ (validate.rules).string.min_len = 1 ];
+    string id = 1 [(validate.rules).string.min_len = 1];
     // The vector.
-    repeated float vector = 2 [ (validate.rules).repeated .min_items = 2 ];
+    repeated float vector = 2 [(validate.rules).repeated.min_items = 2];
   }
 
   // Represent multiple vectors.
-  message Vectors { repeated Vector vectors = 1; }
+  message Vectors {
+    repeated Vector vectors = 1;
+  }
 
   // Represent stream response of the vector.
   message StreamVector {
@@ -375,7 +377,7 @@ message Object {
   // Represent the binary object.
   message Blob {
     // The object ID.
-    string id = 1 [ (validate.rules).string.min_len = 1 ];
+    string id = 1 [(validate.rules).string.min_len = 1];
     // The binary object.
     bytes object = 2;
   }
@@ -411,7 +413,9 @@ message Object {
   }
 
   // Represent multiple vector locations.
-  message Locations { repeated Location locations = 1; }
+  message Locations {
+    repeated Location locations = 1;
+  }
 }
 
 // Control related messages.
@@ -419,17 +423,16 @@ message Control {
   // Represent the create index request.
   message CreateIndexRequest {
     // The pool size of the create index operation.
-    uint32 pool_size = 1 [ (validate.rules).uint32.gte = 0 ];
+    uint32 pool_size = 1 [(validate.rules).uint32.gte = 0];
   }
 }
 
 // Discoverer related messages.
 message Discoverer {
-
   // Represent the dicoverer request.
   message Request {
     // The agent name to be discovered.
-    string name = 1 [ (validate.rules).string.min_len = 1 ];
+    string name = 1 [(validate.rules).string.min_len = 1];
     // The namespace to be discovered.
     string namespace = 2;
     // The node to be discovered.
@@ -439,10 +442,8 @@ message Discoverer {
 
 // Info related messages.
 message Info {
-
   // Represent the index information messages.
   message Index {
-
     // Represent the index count message.
     message Count {
       // The stored index count.
@@ -458,9 +459,13 @@ message Info {
     // Represent the UUID message.
     message UUID {
       // The committed UUID.
-      message Committed { string uuid = 1; }
+      message Committed {
+        string uuid = 1;
+      }
       // The uncommitted UUID.
-      message Uncommitted { string uuid = 1; }
+      message Uncommitted {
+        string uuid = 1;
+      }
     }
   }
 
@@ -473,7 +478,7 @@ message Info {
     // The namespace of the pod.
     string namespace = 3;
     // The IP of the pod.
-    string ip = 4 [ (validate.rules).string.ipv4 = true ];
+    string ip = 4 [(validate.rules).string.ipv4 = true];
     // The CPU information of the pod.
     CPU cpu = 5;
     // The memory information of the pod.
@@ -521,17 +526,19 @@ message Info {
   // Represent the multiple pod information message.
   message Pods {
     // The multiple pod information.
-    repeated Pod pods = 1 [ (validate.rules).repeated .min_items = 1 ];
+    repeated Pod pods = 1 [(validate.rules).repeated.min_items = 1];
   }
 
   // Represent the multiple node information message.
   message Nodes {
     // The multiple node information.
-    repeated Node nodes = 1 [ (validate.rules).repeated .min_items = 1 ];
+    repeated Node nodes = 1 [(validate.rules).repeated.min_items = 1];
   }
 
   // Represent the multiple IP message.
-  message IPs { repeated string ip = 1; }
+  message IPs {
+    repeated string ip = 1;
+  }
 }
 
 // Represent an empty message.
diff --git a/apis/proto/v1/vald/filter.proto b/apis/proto/v1/vald/filter.proto
index a33f7d04ef..31ff34d9fe 100644
--- a/apis/proto/v1/vald/filter.proto
+++ b/apis/proto/v1/vald/filter.proto
@@ -23,97 +23,84 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdFilter";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Filter service provides ways to connect to Vald through filter.
 service Filter {
-
   // A method to search object.
-  rpc SearchObject(payload.v1.Search.ObjectRequest)
-      returns (payload.v1.Search.Response) {
+  rpc SearchObject(payload.v1.Search.ObjectRequest) returns (payload.v1.Search.Response) {
     option (google.api.http) = {
-      post : "/search/object"
-      body : "*"
+      post: "/search/object"
+      body: "*"
     };
   }
 
   // A method to search multiple objects.
-  rpc MultiSearchObject(payload.v1.Search.MultiObjectRequest)
-      returns (payload.v1.Search.Responses) {
+  rpc MultiSearchObject(payload.v1.Search.MultiObjectRequest) returns (payload.v1.Search.Responses) {
     option (google.api.http) = {
-      post : "/search/object/multiple"
-      body : "*"
+      post: "/search/object/multiple"
+      body: "*"
     };
   }
 
   // A method to search object by bidirectional streaming.
-  rpc StreamSearchObject(stream payload.v1.Search.ObjectRequest)
-      returns (stream payload.v1.Search.StreamResponse) {}
+  rpc StreamSearchObject(stream payload.v1.Search.ObjectRequest) returns (stream payload.v1.Search.StreamResponse) {}
 
   // A method insert object.
-  rpc InsertObject(payload.v1.Insert.ObjectRequest)
-      returns (payload.v1.Object.Location) {
+  rpc InsertObject(payload.v1.Insert.ObjectRequest) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/insert/object"
-      body : "*"
+      post: "/insert/object"
+      body: "*"
     };
   }
 
   // Represent the streaming RPC to insert object by bidirectional streaming.
-  rpc StreamInsertObject(stream payload.v1.Insert.ObjectRequest)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamInsertObject(stream payload.v1.Insert.ObjectRequest) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to insert multiple objects.
-  rpc MultiInsertObject(payload.v1.Insert.MultiObjectRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiInsertObject(payload.v1.Insert.MultiObjectRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/insert/object/multiple"
-      body : "*"
+      post: "/insert/object/multiple"
+      body: "*"
     };
   }
 
   // A method to update object.
-  rpc UpdateObject(payload.v1.Update.ObjectRequest)
-      returns (payload.v1.Object.Location) {
+  rpc UpdateObject(payload.v1.Update.ObjectRequest) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/update/object"
-      body : "*"
+      post: "/update/object"
+      body: "*"
     };
   }
 
   // A method to update object by bidirectional streaming.
-  rpc StreamUpdateObject(stream payload.v1.Update.ObjectRequest)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamUpdateObject(stream payload.v1.Update.ObjectRequest) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to update multiple objects.
-  rpc MultiUpdateObject(payload.v1.Update.MultiObjectRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiUpdateObject(payload.v1.Update.MultiObjectRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/update/object/multiple"
-      body : "*"
+      post: "/update/object/multiple"
+      body: "*"
     };
   }
 
   // A method to upsert object.
-  rpc UpsertObject(payload.v1.Upsert.ObjectRequest)
-      returns (payload.v1.Object.Location) {
+  rpc UpsertObject(payload.v1.Upsert.ObjectRequest) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/upsert/object"
-      body : "*"
+      post: "/upsert/object"
+      body: "*"
     };
   }
 
   // A method to upsert object by bidirectional streaming.
-  rpc StreamUpsertObject(stream payload.v1.Upsert.ObjectRequest)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamUpsertObject(stream payload.v1.Upsert.ObjectRequest) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to upsert multiple objects.
-  rpc MultiUpsertObject(payload.v1.Upsert.MultiObjectRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiUpsertObject(payload.v1.Upsert.MultiObjectRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/upsert/object/multiple"
-      body : "*"
+      post: "/upsert/object/multiple"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/vald/insert.proto b/apis/proto/v1/vald/insert.proto
index 19ed7096fd..1d5479456e 100644
--- a/apis/proto/v1/vald/insert.proto
+++ b/apis/proto/v1/vald/insert.proto
@@ -23,30 +23,27 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdInsert";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Insert service provides ways to add new vectors.
 service Insert {
-
   // A method to add a new single vector.
   rpc Insert(payload.v1.Insert.Request) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/insert"
-      body : "*"
+      post: "/insert"
+      body: "*"
     };
   }
 
   // A method to add new multiple vectors by bidirectional streaming.
-  rpc StreamInsert(stream payload.v1.Insert.Request)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamInsert(stream payload.v1.Insert.Request) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to add new multiple vectors in a single request.
-  rpc MultiInsert(payload.v1.Insert.MultiRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiInsert(payload.v1.Insert.MultiRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/insert/multiple"
-      body : "*"
+      post: "/insert/multiple"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/vald/object.proto b/apis/proto/v1/vald/object.proto
index ea36040b50..f275e29096 100644
--- a/apis/proto/v1/vald/object.proto
+++ b/apis/proto/v1/vald/object.proto
@@ -23,24 +23,21 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdObject";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Object service provides ways to fetch indexed vectors.
 service Object {
-
   // A method to check whether a specified ID is indexed or not.
   rpc Exists(payload.v1.Object.ID) returns (payload.v1.Object.ID) {
     option (google.api.http).get = "/exists/{id}";
   }
 
   // A method to fetch a vector.
-  rpc GetObject(payload.v1.Object.VectorRequest)
-      returns (payload.v1.Object.Vector) {
+  rpc GetObject(payload.v1.Object.VectorRequest) returns (payload.v1.Object.Vector) {
     option (google.api.http).get = "/object/{id.id}";
   }
 
   // A method to fetch vectors by bidirectional streaming.
-  rpc StreamGetObject(stream payload.v1.Object.VectorRequest)
-      returns (stream payload.v1.Object.StreamVector) {}
+  rpc StreamGetObject(stream payload.v1.Object.VectorRequest) returns (stream payload.v1.Object.StreamVector) {}
 }
diff --git a/apis/proto/v1/vald/remove.proto b/apis/proto/v1/vald/remove.proto
index 8e171dae9e..aac732f81b 100644
--- a/apis/proto/v1/vald/remove.proto
+++ b/apis/proto/v1/vald/remove.proto
@@ -23,30 +23,27 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdRemove";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Remove service provides ways to remove indexed vectors.
 service Remove {
-
   // A method to remove an indexed vector.
   rpc Remove(payload.v1.Remove.Request) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/remove"
-      body : "*"
+      post: "/remove"
+      body: "*"
     };
   }
 
   // A method to remove multiple indexed vectors by bidirectional streaming.
-  rpc StreamRemove(stream payload.v1.Remove.Request)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamRemove(stream payload.v1.Remove.Request) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to remove multiple indexed vectors in a single request.
-  rpc MultiRemove(payload.v1.Remove.MultiRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiRemove(payload.v1.Remove.MultiRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/remove/multiple"
-      body : "*"
+      post: "/remove/multiple"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/vald/search.proto b/apis/proto/v1/vald/search.proto
index a5cc5a271e..ec854349c2 100644
--- a/apis/proto/v1/vald/search.proto
+++ b/apis/proto/v1/vald/search.proto
@@ -23,98 +23,86 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdSearch";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Search service provides ways to search indexed vectors.
 service Search {
-
   // A method to search indexed vectors by a raw vector.
   rpc Search(payload.v1.Search.Request) returns (payload.v1.Search.Response) {
     option (google.api.http) = {
-      post : "/search"
-      body : "*"
+      post: "/search"
+      body: "*"
     };
   }
 
   // A method to search indexed vectors by ID.
-  rpc SearchByID(payload.v1.Search.IDRequest)
-      returns (payload.v1.Search.Response) {
+  rpc SearchByID(payload.v1.Search.IDRequest) returns (payload.v1.Search.Response) {
     option (google.api.http) = {
-      post : "/search/id"
-      body : "*"
+      post: "/search/id"
+      body: "*"
     };
   }
 
   // A method to search indexed vectors by multiple vectors.
-  rpc StreamSearch(stream payload.v1.Search.Request)
-      returns (stream payload.v1.Search.StreamResponse) {}
+  rpc StreamSearch(stream payload.v1.Search.Request) returns (stream payload.v1.Search.StreamResponse) {}
 
   // A method to search indexed vectors by multiple IDs.
-  rpc StreamSearchByID(stream payload.v1.Search.IDRequest)
-      returns (stream payload.v1.Search.StreamResponse) {}
+  rpc StreamSearchByID(stream payload.v1.Search.IDRequest) returns (stream payload.v1.Search.StreamResponse) {}
 
   // A method to search indexed vectors by multiple vectors in a single request.
-  rpc MultiSearch(payload.v1.Search.MultiRequest)
-      returns (payload.v1.Search.Responses) {
+  rpc MultiSearch(payload.v1.Search.MultiRequest) returns (payload.v1.Search.Responses) {
     option (google.api.http) = {
-      post : "/search/multiple"
-      body : "*"
+      post: "/search/multiple"
+      body: "*"
     };
   }
 
   // A method to search indexed vectors by multiple IDs in a single request.
-  rpc MultiSearchByID(payload.v1.Search.MultiIDRequest)
-      returns (payload.v1.Search.Responses) {
+  rpc MultiSearchByID(payload.v1.Search.MultiIDRequest) returns (payload.v1.Search.Responses) {
     option (google.api.http) = {
-      post : "/search/id/multiple"
-      body : "*"
+      post: "/search/id/multiple"
+      body: "*"
     };
   }
 
   // A method to linear search indexed vectors by a raw vector.
-  rpc LinearSearch(payload.v1.Search.Request)
-      returns (payload.v1.Search.Response) {
+  rpc LinearSearch(payload.v1.Search.Request) returns (payload.v1.Search.Response) {
     option (google.api.http) = {
-      post : "/linearsearch"
-      body : "*"
+      post: "/linearsearch"
+      body: "*"
     };
   }
 
   // A method to linear search indexed vectors by ID.
-  rpc LinearSearchByID(payload.v1.Search.IDRequest)
-      returns (payload.v1.Search.Response) {
+  rpc LinearSearchByID(payload.v1.Search.IDRequest) returns (payload.v1.Search.Response) {
     option (google.api.http) = {
-      post : "/linearsearch/id"
-      body : "*"
+      post: "/linearsearch/id"
+      body: "*"
     };
   }
 
   // A method to linear search indexed vectors by multiple vectors.
-  rpc StreamLinearSearch(stream payload.v1.Search.Request)
-      returns (stream payload.v1.Search.StreamResponse) {}
+  rpc StreamLinearSearch(stream payload.v1.Search.Request) returns (stream payload.v1.Search.StreamResponse) {}
 
   // A method to linear search indexed vectors by multiple IDs.
-  rpc StreamLinearSearchByID(stream payload.v1.Search.IDRequest)
-      returns (stream payload.v1.Search.StreamResponse) {}
+  rpc StreamLinearSearchByID(stream payload.v1.Search.IDRequest) returns (stream payload.v1.Search.StreamResponse) {}
 
   // A method to linear search indexed vectors by multiple vectors in a single
   // request.
-  rpc MultiLinearSearch(payload.v1.Search.MultiRequest)
-      returns (payload.v1.Search.Responses) {
+  rpc MultiLinearSearch(payload.v1.Search.MultiRequest) returns (payload.v1.Search.Responses) {
     option (google.api.http) = {
-      post : "/linearsearch/multiple"
-      body : "*"
+      post: "/linearsearch/multiple"
+      body: "*"
     };
   }
 
   // A method to linear search indexed vectors by multiple IDs in a single
   // request.
-  rpc MultiLinearSearchByID(payload.v1.Search.MultiIDRequest)
-      returns (payload.v1.Search.Responses) {
+  rpc MultiLinearSearchByID(payload.v1.Search.MultiIDRequest) returns (payload.v1.Search.Responses) {
     option (google.api.http) = {
-      post : "/linearsearch/id/multiple"
-      body : "*"
+      post: "/linearsearch/id/multiple"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/vald/update.proto b/apis/proto/v1/vald/update.proto
index 611a91a1d9..ea0c8a2e67 100644
--- a/apis/proto/v1/vald/update.proto
+++ b/apis/proto/v1/vald/update.proto
@@ -23,30 +23,27 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdUpdate";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Update service provides ways to update indexed vectors.
 service Update {
-
   // A method to update an indexed vector.
   rpc Update(payload.v1.Update.Request) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/update"
-      body : "*"
+      post: "/update"
+      body: "*"
     };
   }
 
   // A method to update multiple indexed vectors by bidirectional streaming.
-  rpc StreamUpdate(stream payload.v1.Update.Request)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamUpdate(stream payload.v1.Update.Request) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to update multiple indexed vectors in a single request.
-  rpc MultiUpdate(payload.v1.Update.MultiRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiUpdate(payload.v1.Update.MultiRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/update/multiple"
-      body : "*"
+      post: "/update/multiple"
+      body: "*"
     };
   }
 }
diff --git a/apis/proto/v1/vald/upsert.proto b/apis/proto/v1/vald/upsert.proto
index 3d984fd88a..abe3384ef5 100644
--- a/apis/proto/v1/vald/upsert.proto
+++ b/apis/proto/v1/vald/upsert.proto
@@ -23,30 +23,27 @@ import "github.com/googleapis/googleapis/google/api/annotations.proto";
 
 option go_package = "github.com/vdaas/vald/apis/grpc/v1/vald";
 option java_multiple_files = true;
-option java_package = "org.vdaas.vald.api.v1.vald";
 option java_outer_classname = "ValdUpsert";
+option java_package = "org.vdaas.vald.api.v1.vald";
 
 // Upsert service provides ways to insert/update vectors.
 service Upsert {
-
   // A method to insert/update a vector.
   rpc Upsert(payload.v1.Upsert.Request) returns (payload.v1.Object.Location) {
     option (google.api.http) = {
-      post : "/upsert"
-      body : "*"
+      post: "/upsert"
+      body: "*"
     };
   }
 
   // A method to insert/update multiple vectors by bidirectional streaming.
-  rpc StreamUpsert(stream payload.v1.Upsert.Request)
-      returns (stream payload.v1.Object.StreamLocation) {}
+  rpc StreamUpsert(stream payload.v1.Upsert.Request) returns (stream payload.v1.Object.StreamLocation) {}
 
   // A method to insert/update multiple vectors in a single request.
-  rpc MultiUpsert(payload.v1.Upsert.MultiRequest)
-      returns (payload.v1.Object.Locations) {
+  rpc MultiUpsert(payload.v1.Upsert.MultiRequest) returns (payload.v1.Object.Locations) {
     option (google.api.http) = {
-      post : "/upsert/multiple"
-      body : "*"
+      post: "/upsert/multiple"
+      body: "*"
     };
   }
 }
diff --git a/versions/BUF_VERSION b/versions/BUF_VERSION
new file mode 100644
index 0000000000..e3e48c4c4f
--- /dev/null
+++ b/versions/BUF_VERSION
@@ -0,0 +1 @@
+v1.22.0