如何在Elasticsearch中从前缀搜索中排除匹配的术语？

Question

Is there any way how to tell Elastic to exclude matched terms for "prefix" searching?

Consider this query:

{
    "query": {
        "bool": {
            "must": [
                {"match": {"title": "word1"}},
                {"match": {"title": "word2"}},
                {"prefix": {"title": "w"}}
            ]
        }
    }
}

and stored documents in an index:

{"title": "word1 word2", "data": "..."}
{"title": "word2 word1", "data": "..."}
{"title": "word1 word2 www", "data": "..."}
{"title": "word1 www word2", "data": "..."}
{"title": "www word2 word1", "data": "..."}
{"title": "xxx www word2 word1", "data": "..."}

then all these documents will be in query response (because terms "word1", "word2" and "www" has "w" prefix).

But that's not ok for me. I need to obtain only these documents:

{"title": "word1 word2 www", "data": "..."}
{"title": "word1 www word2", "data": "..."}
{"title": "www word2 word1", "data": "..."}

Is there any way to do this?

Answer 1

Based on the output you mentioned, you need word1 , word2 and www to be all present in the title.

For prefix matching, you need to match it with title.keyword and not title since the inverted index does contain atleast one work with w as prefix. But as i understand, you want the prefix for the entire title so keyword should achieve that.

Below query works and gives expected results:

{
      "query": {
        "bool": {
          "must": [
            {
              "match": {
                "title": "word1"
              }
            },
            {
              "match": {
                "title": "word2"
              }
            },
            {
              "match": {
                "title": "www"
              }
            },
            {
              "prefix": {
                "title.keyword": "w"
              }
            }
          ]
        }
      }
    }