# Change in trend detection in elasticsearch

**URL:** <https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881>\
**Category:** Elasticsearch\
**Created:** [October 31, 2017, 12:14pm UTC](https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881 "2017-10-31T12:14:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![eng.behjati](https://avatars.discourse-cdn.com/v4/letter/e/6bbea6/32.png) [@eng.behjati](https://discuss.elastic.co/u/eng.behjati)\
**Post date:** [October 31, 2017, 12:14pm UTC](https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881/1 "2017-10-31T12:14:19Z")

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Hi everyone!

I have a few questions. can you help me?

I have an Elasticsearch db engine that holds posts gathered from social networks and websites contents.  
I use percolate these posts to match some queries and I want to detect changes that might happened in the rate of posts that match a specific query

how should I do it? Does it need machine learning or it is just extrapolation( points will be times that posts match the query) ?

I'll thankful if you help me.

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**Author:** ![Mark\_Harwood](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mark_harwood/32/10538_2.png) [@Mark\_Harwood](https://discuss.elastic.co/u/Mark_Harwood)\
**Post date:** [November 1, 2017, 10:55am UTC](https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881/2 "2017-11-01T10:55:26Z")

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> [@eng.behjati](#):
>
> I want to detect changes that might happened in the rate of posts that match a specific query

Have you looked at Watcher? [Getting Started with Watcher | X-Pack for the Elastic Stack [6.2] | Elastic](https://www.elastic.co/guide/en/x-pack/current/watcher-getting-started.html)

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<div class="post-metadata">

**Author:** ![eng.behjati](https://avatars.discourse-cdn.com/v4/letter/e/6bbea6/32.png) [@eng.behjati](https://discuss.elastic.co/u/eng.behjati)\
**Post date:** [November 14, 2017, 3:26pm UTC](https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881/3 "2017-11-14T15:26:35Z")

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thanks for your attention

yes. I looked  
but I want to know how does watcher work exactly?

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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:** [December 12, 2017, 3:26pm UTC](https://discuss.elastic.co/t/change-in-trend-detection-in-elasticsearch/105881/4 "2017-12-12T15:26:48Z")

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