I got an error in the elastic search indexer module.i have installed elasticsearch version 7.9 with magento2.

```
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Unknown filter type [phonetic] for [phonetic]"}],"type":"illegal_argument_exception","reason":"Unknown filter type [phonetic] for [phonetic]"},"status":400}

```

how can i fix this issue ??