Change in trend detection in elasticsearch

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.

Have you looked at Watcher? Getting Started with Watcher | X-Pack for the Elastic Stack [6.2] | Elastic

thanks for your attention

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

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