Conditional highlighting

[nik9000]

I highlight two fields but only use the highlighting from one of them if there aren't matches in the first field. I think it'd be cool not to highlight the second field at all if there is a match in the first field. Mostly I like this idea because that second field is typically much much larger than the first field and takes some time to highlight.

      "fields": {
         "summary": {
            "number_of_fragments": 1,
            "fragment_size": 100,
            "no_match_size": 100
         },
         "contents": {
            "number_of_fragments": 1,
            "fragment_size": 100,
            "unless": ["text"]
         }
     }

or

      "fields": {
         "summary": {
            "number_of_fragments": 1,
            "fragment_size": 100,
            "no_match_size": 100,
            "when_no_match": {
               "contents": {
                  "number_of_fragments": 1,
                  "fragment_size": 100,
                  "unless": ["summary"]
               }
            }
         }
     }

Note that I really only need that no match snippet from the first field if there aren't matches in either field but it felt simpler to declare it on the first field.

I'll happy to implement this but would some thoughts on my proposed api.

[nik9000]

I picked this back up after doing some performance testing. I found out that highlighting if one of the heaviest consumers of CPU for my use case. So I figured anything that I can do to lower it would be useful. This could allow you to skip highlighting some fields entirely.

Implemented this with a different api. It looks like:

{
    "highlight": {
        "fields": {
            "title": {
                "conditional": {
                    "match": {
                        "text": {
                            "no_match_size": 100,
                            "skip_matching":  true
                        }
                    }
                    "no_match": {
                        "text": {
                            "no_match_size": 100
                        }
                    },
                }
            }
        }
    }
}

Each field can contain a conditional field. There no limit other then your imagination. And memory.