# Fast Vector Highlighter not working with query on synonym analyzer in 5.0.0-beta1 as in 2.4.0

**URL:** <https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087>\
**Category:** Elasticsearch\
**Created:** [October 3, 2016, 3:43pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087 "2016-10-03T15:43:30Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![apang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/apang/32/22400_2.png) [@apang](https://discuss.elastic.co/u/apang)\
**Post date:** [October 3, 2016, 3:43pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087/1 "2016-10-03T15:43:30Z")

</div>

How to reproduce:

In 2.4.0 I created an index with the following settings and mappings:

```
PUT my_index
{
  "settings": {
    "analysis": {
      "filter": {
        "synonym": {
          "format": "wordnet",
          "type": "synonym",
          "synonyms_path": "analysis/wordnet/english/wn_s.pl"
        }
      },
      "analyzer": {
        "synonym": {
          "type": "custom",
          "filter": [
            "synonym"
          ],
          "tokenizer": "standard",
          "ignore_case":"true"
        }
      }
    }
  },
  "mappings": {
    "my_type": {
      "dynamic_templates": [
        {
          "strings": {
            "mapping": {
              "docs": {
                "similarity": "BM25"
              },
              "term_vector": "with_positions_offsets",
              "type": "string",
              "fields": {
                "raw": {
                  "ignore_above": 4000,
                  "index": "not_analyzed",
                  "type": "string"
                }
              }
            },
            "match_mapping_type": "string"
          }
        }
      ]
    }
  }
}

```

Index settings and mapping In 5.0.0-beta1:

```
PUT my_index
{
  "settings": {
    "analysis": {
      "filter": {
        "synonym": {
          "format": "wordnet",
          "type": "synonym",
          "synonyms_path": "analysis/wordnet/english/wn_s.pl"
        }
      },
      "analyzer": {
        "synonym": {
          "filter": [
            "synonym"
          ],
          "tokenizer": "standard",
          "ignore_case": "true"
        }
      }
    }
  },
  "mappings": {
    "my_type": {
      "dynamic_templates": [
        {
          "strings": {
            "mapping": {
              "term_vector": "with_positions_offsets",
              "type": "text",
              "fields": {
                "raw": {
                  "ignore_above": 4000,
                  "index": true,
                  "type": "keyword"
                }
              }
            },
            "match_mapping_type": "string"
          }
        }
      ]
    }
  }
}

```

Added document with:

```
PUT my_index/my_type/1
{
  "my_string":"the quick brown fox jumped over the lazy dog"
}

```

Search (for "fast"):

```
GET my_index/my_type/_search
{
  "query": {
    "match": {
      "my_string": {
        "query": "fast",
        "analyzer":"synonym"
      }
    }
  },
  "highlight": {
    "fields": {
      "my_string": {}
    }
  }
}

```

Result from Elasticsearch 2.4.0:

```
{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.0073345946,
    "hits": [
      {
        "_index": "my_index",
        "_type": "my_type",
        "_id": "1",
        "_score": 0.0073345946,
        "_source": {
          "my_string": "the quick brown fox jumped over the lazy dog"
        },
        "highlight": {
          "my_string": [
            "the <em>quick</em> brown fox jumped over the lazy dog"
          ]
        }
      }
    ]
  }
}

```

Result from Elasticsearch 5.0.0:

```
{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.27233246,
    "hits": [
      {
        "_index": "my_index",
        "_type": "my_type",
        "_id": "1",
        "_score": 0.27233246,
        "_source": {
          "my_string": "the quick brown fox jumped over the lazy dog"
        }
      }
    ]
  }
}

```

As shown above, the result is matched as expected, but the highlighter fails to highlight the synonym "quick" in 5.0.0.

The only difference in configuration is the dynamic template mapping for strings which uses "text" instead of "string" as noted in the breaking changes at [https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking\_50\_mapping\_changes.html#\_literal\_string\_literal\_fields\_replaced\_by\_literal\_text\_literal\_literal\_keyword\_literal\_fields](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking_50_mapping_changes.html#_literal_string_literal_fields_replaced_by_literal_text_literal_literal_keyword_literal_fields)

Is something wrong with my query or configuration in 5.0.0?

---

<div class="post-metadata">

**Author:** ![apang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/apang/32/22400_2.png) [@apang](https://discuss.elastic.co/u/apang)\
**Post date:** [October 3, 2016, 4:14pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087/2 "2016-10-03T16:14:59Z")

</div>

If I force the highlighter type to plain, the synonym gets highlighted in 5.0.0-beta1 (but then I can't highlight phrases).

Forcing the highlighter type to fast-vector-highlighter in 2.4.0 still highlights the synonym, so is there something different about the fast-vector-highlighter in 5.0?.

---

<div class="post-metadata">

**Author:** ![apang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/apang/32/22400_2.png) [@apang](https://discuss.elastic.co/u/apang)\
**Post date:** [October 20, 2016, 3:41pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087/3 "2016-10-20T15:41:28Z")

</div>

Turns out it was a bug: [https://github.com/elastic/elasticsearch/issues/20781](https://github.com/elastic/elasticsearch/issues/20781)

Looks like it's fixed in 5.0.0 GA.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:06pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-not-working-with-query-on-synonym-analyzer-in-5-0-0-beta1-as-in-2-4-0/62087/4 "2017-07-05T22:06:26Z")

</div>