Fixed Elasticsearch server returned no response. Is it running?

That's indicative that your ES instance is either having problems or needs to be configured. The application can only report the issue; getting this error is generally indicative of outside issues (it's similar to failing to connect to MySQL).
Four communities on this server use the Elasticsearch program but only one have the that problem.
The question is why an how to fix it.

Restart Elasticsearch or disable this add on on that forum that makes the problem, an than activate and make a cache rebuild?
How to fix?

Elasticsearch server returned no response. Is it running?
25 minutes ago - library/XenES/Search/SourceHandler/ElasticSearch.php:1012

#0 /var/www/html/library/XenES/Search/SourceHandler/ElasticSearch.php(361): XenES_Search_SourceHandler_ElasticSearch->_logSearchResponseError(false, true)
#1 /var/www/html/library/XenForo/Search/SourceHandler/Abstract.php(115): XenES_Search_SourceHandler_ElasticSearch->executeSearch('', false, Array, Array, false, '200')
#2 /var/www/html/library/XenForo/Search/Searcher.php(79): XenForo_Search_SourceHandler_Abstract->searchGeneral('', Array, 'date', '200')
#3 /var/www/html/library/TagEss/XenForo/ControllerPublic/Forum.php(137): XenForo_Search_Searcher->searchGeneral('', Array, 'date')
#4 /var/www/html/library/XenForo/FrontController.php(351): TagEss_XenForo_ControllerPublic_Forum->actionTagged()
#5 /var/www/html/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#6 /var/www/html/index.php(13): XenForo_FrontController->run()
#7 {main}

Automatically one day it appeared once.
I have to run the service elasticsearch start to continue using
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