Elasticsearch provides the following search types to be executed:
query_then_fetch: This is the default search type available in Elasticsearch. It follows a two-phase search execution. In the first phase (query), the query goes to a coordinating node that further forwards the query to all the relevant shards. Each shard searches the documents, sorts them locally, and returns the results to the coordinating node. The coordinating node further merges all the results, sorts them, and returns the result to the caller. The final results are of the maximum size specified in the size parameter with the search request.dfs_query_then_fetch: This is similar to thequery_then_fetchsearch type, but asks Elasticsearch to do some extra processing for more accurate scoring of documents. In thefetchphase, all the shards compute the distributed term frequencies.scan: The scan search type differs from normal search requests because it does not involve any scoring...