# Increase index.mapping.total\_fields.limit

**URL:** <https://forum.opensearch.org/t/increase-index-mapping-total-fields-limit/23644>\
**Category:** OpenSearch\
**Created:** [March 5, 2025, 8:15am UTC](https://forum.opensearch.org/t/increase-index-mapping-total-fields-limit/23644 "2025-03-05T08:15:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dbgtmaster](https://avatars.discourse-cdn.com/v4/letter/d/df705f/32.png) [@dbgtmaster](https://forum.opensearch.org/u/dbgtmaster)\
**Post date:** [March 5, 2025, 8:15am UTC](https://forum.opensearch.org/t/increase-index-mapping-total-fields-limit/23644/1 "2025-03-05T08:15:02Z")

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Hi,

we have an opensearch cluster with 6 nodes and 16TB docs usage.

There is an option ‘index.mapping.total\_fields.limit’ which limits the fields in an index. As far as I have researched, more fields mean higher memory usage and increased CPU load.

We would like to add ~500-1000 unique additional fields to all indices. Is it a problem to increase the value from 1000 to, for example, 4000? I know that indexing more fields requires more CPU usage during indexing, and each field consumes more memory.

Is the adjustment of the value really noticeable?

Regards,  
Thomas