Hotfix: Fix search_total_indexing_time metric type

[nantiferov]

According to my tests with real workload, this metric type is counter, I'm renaming it according to Prometheus recommendations and moving to metricMapCounters map.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.94%. Comparing base (c59f5c4) to head (b3738c1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #958   +/-   ##
=======================================
  Coverage   81.94%   81.94%           
=======================================
  Files          18       18           
  Lines        2204     2204           
=======================================
  Hits         1806     1806           
  Misses        311      311           
  Partials       87       87           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[coveralls]

Pull Request Test Coverage Report for Build 11233460310

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 85.368%

---

Totals
Change from base Build 11228266063:	0.006%
Covered Lines:	2252
Relevant Lines:	2638

---

💛 - Coveralls

[nantiferov]

Not urgent, so far we just have warnings from Grafana that metric name doesn't end with _total

[oliver006]

Thanks for the quick fix!

[oliver006]

https://github.com/oliver006/redis_exporter/releases/tag/v1.64.1