Really old elasticsearch libraries used

Summary

really old libraries are used for the elasticsearch support:

• elasticsearch-model 0.1.9 2016-05-05
• elasticsearch-rails 0.1.9 2016-05-05
• elasticsearch-api 5.0.3 2017-02-07

What is the current bug behavior?

really old libraries are used

What is the expected correct behavior?

For all those libraries we have releases from August 2019. any specific reasons why those are not used? From the git blame it looks like those libraries havent been bumped in ages.