Add Async Document Store Mixin Tests to Avoid Duplicating Test Code in DocumentStore integrations #10799
Description
Is your feature request related to a problem? Please describe.
I found it useful when working on a recent PR to use the mixin tests added in #10477. It saves time rewriting tests that are largely the same between DocumentStore integrations and it would be good to have equivalent generic tests for async methods as well.
Describe the solution you'd like
Write generic tests in haystack.testing.document_store based off of tests from DocumentStore integrations such as elasticsearch and chromadb which has comprehensive async tests.
Describe alternatives you've considered
Writing various async tests for each DocumentStore integration.
Additional context