# Benchmarking index size increase with new mapping parameters

**URL:** <https://discuss.elastic.co/t/benchmarking-index-size-increase-with-new-mapping-parameters/132130>\
**Category:** Elasticsearch\
**Created:** [May 16, 2018, 1:08pm UTC](https://discuss.elastic.co/t/benchmarking-index-size-increase-with-new-mapping-parameters/132130 "2018-05-16T13:08:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![randomuser](https://avatars.discourse-cdn.com/v4/letter/r/958977/32.png) [@randomuser](https://discuss.elastic.co/u/randomuser)\
**Post date:** [May 16, 2018, 1:08pm UTC](https://discuss.elastic.co/t/benchmarking-index-size-increase-with-new-mapping-parameters/132130/1 "2018-05-16T13:08:19Z")

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Hello,

So I'm trying to add new mapping parameters to my index, reindex, and then compare the index size increase. Specifically, I'm interested in the term\_vectors field and how much it would increase index size.. should I use it, is it recommended, what are the benefits and example use cases?

The problem is, I'm reindexing indices using the same mapping, but every time I reindex, the size of the newly created index always differs, shouldn't it be a constant number?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 13, 2018, 1:08pm UTC](https://discuss.elastic.co/t/benchmarking-index-size-increase-with-new-mapping-parameters/132130/2 "2018-06-13T13:08:27Z")

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Closed on June 13, 2018, 1:08pm UTC

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