# Stemmer class not found for light\_bengali

**URL:** <https://discuss.elastic.co/t/stemmer-class-not-found-for-light-bengali/223810>\
**Category:** Elasticsearch\
**Created:** [March 16, 2020, 6:27pm UTC](https://discuss.elastic.co/t/stemmer-class-not-found-for-light-bengali/223810 "2020-03-16T18:27:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![void](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/void/32/50624_2.png) [@void](https://discuss.elastic.co/u/void)\
**Post date:** [March 16, 2020, 6:27pm UTC](https://discuss.elastic.co/t/stemmer-class-not-found-for-light-bengali/223810/1 "2020-03-16T18:27:56Z")

</div>

I am getting an error while creating an index contains light\_bengali stemmer which is supported by es. [Stemmer token filteredit](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-stemmer-tokenfilter.html)

es version: 7.2.0, I tried 7.6.1 too but got the same error

mapping

````auto
        {
          "settings": {
            "number_of_shards": 1,
            "number_of_replicas": 0,
            "refresh_interval": "10s",
            "analysis": {
              "filter": {
                "my_stop": {
                  "type": "stop",
                  "stopwords": "_bengali_"
                },
                "my_stemmer": {
                  "type": "stemmer",
                  "language": "light_bengali"
                }
              },
              "analyzer": {
                "bengali_analyzer": {
                  "tokenizer": "standard",
                  "filter": [
                    "lowercase",
                    "indic_normalization",
                    "bengali_normalization",
                    "my_stop",
                    "my_stemmer"
                  ]
                }
              }
            }},
    ```
and here is the error
    ```
        "type" : "illegal_argument_exception",
            "reason" : "Invalid stemmer class specified: Light_bengali",
            "caused_by" : {
              "type" : "class_not_found_exception",
              "reason" : "org.tartarus.snowball.ext.Light_bengaliStemmer"
            }
    ```
````

---

<div class="post-metadata">

**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\
**Post date:** [March 17, 2020, 5:31pm UTC](https://discuss.elastic.co/t/stemmer-class-not-found-for-light-bengali/223810/2 "2020-03-17T17:31:37Z")

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This looks like a documentation issue, where this has been copy/pasted from somewhere else. Would you mind opening a github issue?

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<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:** [April 14, 2020, 5:43pm UTC](https://discuss.elastic.co/t/stemmer-class-not-found-for-light-bengali/223810/3 "2020-04-14T17:43:10Z")

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