Kibana Discover support kibana 8.10

[nsano-rururu]

Description

Checklist

• [x] I have reviewed the contributing guidelines.
• [x] I have included unit tests for my changes or additions.
• [x] I have successfully run make test-docker with my changes.
• [x] I have manually tested all relevant modes of the change in this PR.
• [x] I have updated the documentation.
• [x] I have updated the changelog.

Questions or Comments

[nsano-rururu]

Last week, I was infected with the coronavirus and was not feeling well, so my response was delayed.

[jertel]

Thanks @nsano-rururu! I hope you're recovered and feeling better.