Elasticsearch Query Processing Sequence

#

Summary

#

Filtered Query affects both the final search and aggregation results, but PostFiltered Query only affects the final search results and does not affect aggregation.

Query Processing Sequence

#

SearchRequest → (Filtered) → Query → (PostFilter) → Result → RescoreQuery
                                   ↓
                              Aggregation → AggregationResult

Filter Query Example

#

{
  "query": {
    "filtered": {
      "filter": {
        "term": {
          "location": "denver"
        }
      }
    }
  }
}

Filter Query affects both search results and Aggregation.

PostFilter Query Example

#

{
  "post_filter": {
    "term": {
      "location": "denver"
    }
  }
}

PostFilter Query only affects search results and does not affect Aggregation results.

Rescore Query Parameters

#

• window_size: The number of top results to rescore per shard
• score_mode: The method of combining main query score and rescore query scores