chore: update indexing to work on ES v6

[mzikherman]

Holding this open until we upgrade to ES v6.

[codecov[bot]]

Codecov Report

Merging #3069 (6a9e8da) into main (fc6eb3c) will not change coverage. The diff coverage is 50.0%.

@@          Coverage Diff          @@
##            main   #3069   +/-   ##
=====================================
  Coverage   83.1%   83.1%           
=====================================
  Files        196     196           
  Lines       5385    5385           
  Branches     988     988           
=====================================
  Hits        4479    4479           
  Misses       654     654           
  Partials     252     252           

[mzikherman]

I think the codecov comment is saying that the coverage isn't changing, but is below the threshhold.