# ES 6.6.2 - Synonym Filter Not Working as Expected

**URL:** <https://discuss.elastic.co/t/es-6-6-2-synonym-filter-not-working-as-expected/190935>\
**Category:** Elasticsearch\
**Created:** [July 17, 2019, 9:17am UTC](https://discuss.elastic.co/t/es-6-6-2-synonym-filter-not-working-as-expected/190935 "2019-07-17T09:17:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![axitxan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/axitxan/32/46143_2.png) [@axitxan](https://discuss.elastic.co/u/axitxan)\
**Post date:** [July 17, 2019, 9:17am UTC](https://discuss.elastic.co/t/es-6-6-2-synonym-filter-not-working-as-expected/190935/1 "2019-07-17T09:17:32Z")

</div>

Version: 6.6.2  
**Issue:** A word which is not present in synonym file is getting tokenised as a synonym.

**Steps to reproduce**

**Step 1:** Create Index  
PUT /test1

```
{
  "settings": {
    "index": {
      "refresh_interval": "5m",
      "number_of_shards": "1",
      "analysis": {
        "filter": {
          "word_delimiter_with_number_filter": {
            "split_on_numerics": "true",
            "generate_word_parts": "true",
            "preserve_original": "false",
            "catenate_words": "true",
            "generate_number_parts": "true",
            "catenate_all": "false",
            "split_on_case_change": "false",
            "type": "word_delimiter",
            "stem_english_possessive": "true"
          },
          "my_misspelled_synonym": {
            "type": "synonym",
            "synonyms": ["a6x => xyz"]
          }
        },
        "analyzer": {
          "my_analyzer": {
            "filter": [
              "word_delimiter_with_number_filter",
              "my_misspelled_synonym"
            ],
            "tokenizer": "whitespace"
          }
        }
      },
      "number_of_replicas": "0"
    }
  }
}

```

**Step 2:** Run analyse query  
POST /test1/\_analyze

```
{ 
    "analyzer": "my_analyzer", 
    "text": "a 6 x"
}

```

Output (Not expected since "a 6 x" is not present in synonym file):

```
{
    "tokens": [
        {
            "token": "xyz",
            "start_offset": 0,
            "end_offset": 5,
            "type": "SYNONYM",
            "position": 0
        }
    ]
}

```

**Step 3:** Creating the same index and running the same analyse query on es 2.3.4 results in different output.

Output with es 2.3.4 (Expected):

```
{
    "tokens": [
        {
            "token": "a",
            "start_offset": 0,
            "end_offset": 1,
            "type": "word",
            "position": 0
        },
        {
            "token": "6",
            "start_offset": 2,
            "end_offset": 3,
            "type": "word",
            "position": 1
        },
        {
            "token": "x",
            "start_offset": 4,
            "end_offset": 5,
            "type": "word",
            "position": 2
        }
    ]
}
```

---

<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:** [August 14, 2019, 9:17am UTC](https://discuss.elastic.co/t/es-6-6-2-synonym-filter-not-working-as-expected/190935/2 "2019-08-14T09:17:40Z")

</div>

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