# \[Query\] Count exist field in elasticsearch

**URL:** <https://discuss.elastic.co/t/query-count-exist-field-in-elasticsearch/220475>\
**Category:** Elasticsearch\
**Created:** [February 22, 2020, 9:07am UTC](https://discuss.elastic.co/t/query-count-exist-field-in-elasticsearch/220475 "2020-02-22T09:07:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![nathlee](https://avatars.discourse-cdn.com/v4/letter/n/ac8455/32.png) [@nathlee](https://discuss.elastic.co/u/nathlee)\
**Post date:** [February 22, 2020, 9:07am UTC](https://discuss.elastic.co/t/query-count-exist-field-in-elasticsearch/220475/1 "2020-02-22T09:07:19Z")

</div>

Hi, I have 2 indices which store logs of two events. Now I want to find how many percents user do event A continue do event B so I count userIDs in index A and I want to count userIDs in index B that exist in index A (I don't know). I know in SQL I can join two indices and count but in elastic search, I don't know-how. I searched pipeline Aggregation is that true? Thanks

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 21, 2020, 9:07am UTC](https://discuss.elastic.co/t/query-count-exist-field-in-elasticsearch/220475/2 "2020-03-21T09:07:23Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.