# Index.codec option **URL:** \ **Category:** Elasticsearch\ **Created:** [March 7, 2021, 3:26pm UTC](https://discuss.elastic.co/t/index-codec-option/266478 "2021-03-07T15:26:50Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jungsoo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jungsoo/32/78042_2.png) [@jungsoo](https://discuss.elastic.co/u/jungsoo)\ **Post date:** [March 7, 2021, 3:26pm UTC](https://discuss.elastic.co/t/index-codec-option/266478/1 "2021-03-07T15:26:51Z")
Hello, I have a question about index.codec. I have been reading document about index settings. ([Index Modules | Elasticsearch Reference [6.2] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/6.2/index-modules.html)) While I was testing index.codec, I realized there was "lucene\_default" option, which wasn't mentioned in the document. I want to know what it means, and whether it is related to compression method. Thank you! ---
**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:** [March 8, 2021, 8:18am UTC](https://discuss.elastic.co/t/index-codec-option/266478/2 "2021-03-08T08:18:36Z")
It means "don't override Lucene's default" and it is used in the test suite since there Lucene's default codec checks lots of extra invariants that the regular codecs do not. It is not useful outside of the test suite. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 5, 2021, 8:19am UTC](https://discuss.elastic.co/t/index-codec-option/266478/3 "2021-04-05T08:19:09Z")
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