# Logs already in Elasticsearch, how to parse? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 4, 2019, 10:09am UTC](https://discuss.elastic.co/t/logs-already-in-elasticsearch-how-to-parse/188882 "2019-07-04T10:09:30Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Feldunoob](https://avatars.discourse-cdn.com/v4/letter/f/b38774/32.png) [@Feldunoob](https://discuss.elastic.co/u/Feldunoob)\ **Post date:** [July 4, 2019, 10:09am UTC](https://discuss.elastic.co/t/logs-already-in-elasticsearch-how-to-parse/188882/1 "2019-07-04T10:09:30Z")
Hello, Currently upgraded to 7.2 i am starting to use ELK, and trying to get efficiently. I didn't notice fast enough that I could use Grok with filebeats, and send to logstash which sends afterwards to Elasticsearch. So now, some logs (~50Gb) are actually already stored in elasticsearch and I need to parse the message tags values since I didn't do it beforehand. Is there any way to parse the data that are already on it, so I could make visualizations efficiently afterwards ? I swear, next time i'll use Grok patterns directly from filebeat to logstash beforehand ! Thanks ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [July 4, 2019, 11:19am UTC](https://discuss.elastic.co/t/logs-already-in-elasticsearch-how-to-parse/188882/2 "2019-07-04T11:19:20Z")
You should be able to use the reindex api together with an ingest pipeline. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 1, 2019, 11:20am UTC](https://discuss.elastic.co/t/logs-already-in-elasticsearch-how-to-parse/188882/3 "2019-08-01T11:20:51Z")
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