ElasticSearch Highlighting not doing what I would expect

Question

I added highlighting into my Elasticsearch queries, however, it appears to be highlighting on fields that I don't think it should.

This is my query:

{
  "from": 0,
  "size": 100,
  "sort": [
    {
      "entityName.raw": {
        "order": "asc"
      }
    }
  ],
  "highlight": {
    "pre_tags": [
      "<span class=\"highlighter\">"
    ],
    "post_tags": [
      "</span>"
    ],
    "fields": {
      "entityName": {},
      "friendlyUrl": {},
      "sentBy": {}
    },
    "require_field_match": true
  },
  "query": {"bool":{"must":[{"match":{"_all":{"query":"test","operator":"and"}}}]}},
  "filter": {
    "bool": {
      "must": [
        {
          "term": {
            "serviceId": "0b6d064d-1430-4b04-99f7-c30dc03860fc"
          }
        },
        {
          "term": {
            "subscriptionId": "a29f30e6-f44b-42cc-82c4-f7cb98cb44ef"
          }
        },
        {
          "term": {
            "subscriptionType": 0
          }
        },
        {
          "terms": {
            "entityType": [
              "4"
            ]
          }
        }
      ]
    }
  }
}

And here is a line on my server that adds the highlighting:

 desc.Highlight(h => h.PreTags("<span class=\"highlighter\">").PostTags("</span>").OnFields(ff => ff.OnField("entityName"), fff => fff.OnField("friendlyUrl"), x => x.OnField("sentBy")));

This query should find any documents that matches the Wildcard john* and the Regexp .* on the keywords field (I need to check for keywords != ""). The problem is when the results come back, the highlighter response comes back and highlights everything in the documents.

It's as if the regexp is ignoring the fact that I told it to only look at the keywords field and is instead matching on all fields. I would expect the highlighter to only highlight the keywords field if it matches .*, but it is not...

What am I doing wrong?

Andrei Stefan Andrei Stefan · Accepted Answer · 2016-05-11T01:21:31

Add "require_field_match": true to your highlighter to force it to match on the queried fields.

ElasticSearch Highlighting not doing what I would expect

1 Answers