# Documentation on settings.index.format

**URL:** <https://discuss.elastic.co/t/documentation-on-settings-index-format/144772>\
**Category:** Elasticsearch\
**Created:** [August 16, 2018, 7:08pm UTC](https://discuss.elastic.co/t/documentation-on-settings-index-format/144772 "2018-08-16T19:08:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![djtecha](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/djtecha/32/54011_2.png) [@djtecha](https://discuss.elastic.co/u/djtecha)\
**Post date:** [August 16, 2018, 7:08pm UTC](https://discuss.elastic.co/t/documentation-on-settings-index-format/144772/1 "2018-08-16T19:08:27Z")

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I can not find any info about what this index setting means. Could someone please explain this or point me to the appropriate ES documentation on it? This is an index setting that I see in system indices like .watcher-history-7

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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:** [September 13, 2018, 7:08pm UTC](https://discuss.elastic.co/t/documentation-on-settings-index-format/144772/2 "2018-09-13T19:08:28Z")

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Closed on September 13, 2018, 7:08pm UTC

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