[SearchBundle, NodeSearchBundle] : change nGram
to ngram
#3331
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When using elastic search 8, elastica throws the following Exception
The [nGram] tokenizer name was deprecated in 7.6. Please use the tokenizer name to [ngram] for indices created in versions 8 or higher instead.
Version 7 uses ngram as well as nGram as can be seen here, https://www.elastic.co/guide/en/elasticsearch/reference/7.14/analysis-ngram-tokenizer.html#_example_output_13 , so this pull request simply lower cases the G's, which allows the search population command to successfully run again