we are using ES for full-text search in our system.
I am wondering if there is any way to stats the query status, including what is the most popular words that user input in our search engine, what is the average time of the queries etc.
You would need to log that yourself using your choice of fields (userID, search term, response time, user-agent, clicked pages ...). Some of this data may be parseable from your webserver's log files. An Elasticsearch index would make a good place to store that sort of information then slice and dice in Kibana
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