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### Description This PR includes the following changes: - Adds AOSS (Amazon OpenSearch Service Serverless) support to OpenSearch. Please refer to the documentation on how to use it. - While creating an index, AOSS only supports Approximate Search with `nmslib` and `faiss` engines. During Search, only Approximate Search and Script Scoring (on doc values) are supported. - This PR also adds support to `efficient_filter` which can be used with `faiss` and `lucene` engines. - The `lucene_filter` is deprecated. Instead please use the `efficient_filter` for the lucene engine. Signed-off-by: Naveen Tatikonda <navtat@amazon.com>