# Reindexing billions of documents

**URL:** <https://discuss.elastic.co/t/reindexing-billions-of-documents/100339>\
**Category:** Elasticsearch\
**Created:** [September 13, 2017, 10:38am UTC](https://discuss.elastic.co/t/reindexing-billions-of-documents/100339 "2017-09-13T10:38:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![an.secure](https://avatars.discourse-cdn.com/v4/letter/a/9d8465/32.png) [@an.secure](https://discuss.elastic.co/u/an.secure)\
**Post date:** [September 13, 2017, 10:38am UTC](https://discuss.elastic.co/t/reindexing-billions-of-documents/100339/1 "2017-09-13T10:38:41Z")

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We are trying to re-index our documents because of a mapping change, the index is likely to grow to billions of documents in future consuming TBs of data. What would be the best way in terms of performance to carry out the reindexing for such huge dataset.

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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:** [October 11, 2017, 10:39am UTC](https://discuss.elastic.co/t/reindexing-billions-of-documents/100339/2 "2017-10-11T10:39:06Z")

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