[Elasticsearch][index_database task] Limit the number of workers
What does this MR do?
The default amount of database connection pool is 5 so we can't create as many workers as we want. This MR creates 4 workers.
UPDATE: OK, we have few defaults: production (10) and development(5). So it means that the fix is not urgent. At the same time, I still think we need to have some thread pool.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together