Standardize format of search params in engine configs

[KShivendu]

Search params across different engines are structured very differently.

In Qdrant configs, we have:

{ "parallel": 1, "search_params": { "hnsw_ef": 64 } }, { "parallel": 1, "search_params": { "hnsw_ef": 128 } }, { "parallel": 1, "search_params": { "hnsw_ef": 256 } }, { "parallel": 1, "search_params": { "hnsw_ef": 512 } },

In Elasticsearch, we have (no nesting):

{ "parallel": 1, "num_candidates": 64 }, { "parallel": 1, "num_candidates": 128 }, { "parallel": 1, "num_candidates": 256 }, { "parallel": 1, "num_candidates": 256 },

In Milvus config, we have:

{ "parallel": 1, "params": { "ef": 128 } }, { "parallel": 1, "params": { "ef": 256 } }, { "parallel": 1, "params": { "ef": 512 } }

In weaviate configs we have:

{ "parallel": 1, "vectorIndexConfig": { "ef": 64} }, { "parallel": 1, "vectorIndexConfig": { "ef": 128} }, { "parallel": 1, "vectorIndexConfig": { "ef": 256} }, { "parallel": 1, "vectorIndexConfig": { "ef": 512} },

the parallel field will remain outside but rest need to passed to the engine and it should have the same name (I propose params). We need to refactor the code accordingly .