XF 2.1 captcha on search

bump!
Here is my elasticsearch statistics:
Documents
2,785,261 (935 MB)

Index updates
34,095

Searches
88,969 (5 milliseconds average)

Allocated memory
264.4 KB

They are not normal based on the traffic of my forum. I see new "searches" every a refresh of the admin page.
Maybe a bot / guest make repeated requests?
 
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