# ES create indexes\\reindex are slow when using a synonym file

**URL:** <https://discuss.elastic.co/t/es-create-indexes-reindex-are-slow-when-using-a-synonym-file/348718>\
**Category:** Elasticsearch\
**Created:** [December 6, 2023, 12:52pm UTC](https://discuss.elastic.co/t/es-create-indexes-reindex-are-slow-when-using-a-synonym-file/348718 "2023-12-06T12:52:04Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![carly.richmond](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/carly.richmond/32/104935_2.png) [@carly.richmond](https://discuss.elastic.co/u/carly.richmond)\
**Post date:** [December 6, 2023, 4:21pm UTC](https://discuss.elastic.co/t/es-create-indexes-reindex-are-slow-when-using-a-synonym-file/348718/2 "2023-12-06T16:21:42Z")

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Hi @ryzhovas,

Welcome! Can you give us more information on your cluster (number of nodes and shards)?

I'm not sure if this is specifically a synonym issue, but it might be worth simulating the number of tokens generated using this file for a particular document using the [`_analyze` API](https://www.elastic.co/guide/en/elasticsearch/reference/current/test-analyzer.html).

Otherwise, it might be down to cluster sizing but it's difficult to say. There are some tips in [this thread too](https://discuss.elastic.co/t/failed-to-process-cluster-event-put-mapping-within-30s/253987).

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