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### Description Add Support for Lucene Filter. When you specify a Lucene filter for a k-NN search, the Lucene algorithm decides whether to perform an exact k-NN search with pre-filtering or an approximate search with modified post-filtering. This filter is supported only for approximate search with the indexes that are created using `lucene` engine. OpenSearch Documentation - https://opensearch.org/docs/latest/search-plugins/knn/filter-search-knn/#lucene-k-nn-filter-implementation Signed-off-by: Naveen Tatikonda <navtat@amazon.com>