Query search log without "suffixes"

(from github.com/markcamos)
Is there a way to query the “Search Log” such that it does not return anything but the actual search term?

When I extract data, it includes things like “content_length…”, “timestamp”, etc. Can I extract just the “search string” without those terms?

Is there a way to do this using the elasticsearch database? I would like to be able to produce a weekly report of top search terms.

(from github.com/marevol)
Search logs are stored in fess_log.* indices.

(from github.com/markcamos)
Thank you - can you recommend a good query tool to access these logs?

(from github.com/marevol)
Kibana