# Bulk Reindexing

**URL:** <https://discuss.elastic.co/t/bulk-reindexing/154723>\
**Category:** Elasticsearch\
**Created:** [October 30, 2018, 8:37pm UTC](https://discuss.elastic.co/t/bulk-reindexing/154723 "2018-10-30T20:37:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wwalker](https://avatars.discourse-cdn.com/v4/letter/w/43a26b/32.png) [@wwalker](https://discuss.elastic.co/u/wwalker)\
**Post date:** [October 30, 2018, 8:37pm UTC](https://discuss.elastic.co/t/bulk-reindexing/154723/1 "2018-10-30T20:37:49Z")

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I have a field that I discovered has been recording values as both uppercase and lowercase. This is causing issues in Kibana data tables as they see `Example` as being different from `example`. I've corrected the issue in Logstash to mutate the field value but I need to reindex all the existing data to have it display properly. How can I go about bulk reindexing these indices?

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [October 31, 2018, 8:49am UTC](https://discuss.elastic.co/t/bulk-reindexing/154723/2 "2018-10-31T08:49:50Z")

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The [Reindex API](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html) sounds like the right tool for this job.

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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:** [November 28, 2018, 8:50am UTC](https://discuss.elastic.co/t/bulk-reindexing/154723/3 "2018-11-28T08:50:06Z")

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