Added the count function, that got lost during the 6.0 upgrade

[0x6368]

This is the related issue: #934

[codecov-io]

Codecov Report

Merging #933 into master will decrease coverage by 0.42%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #933      +/-   ##
============================================
- Coverage     83.13%   82.71%   -0.43%     
- Complexity      414      417       +3     
============================================
  Files            39       39              
  Lines          1364     1371       +7     
============================================
  Hits           1134     1134              
- Misses          230      237       +7     

Impacted Files	Coverage Δ	Complexity Δ
Service/IndexService.php	62.50% <0.00%> (-2.10%)	67.00 <3.00> (+3.00)	⬇️

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[jdreesen]

Maybe this should target the 6.2 branch as it's missing in version 6, too.