UBERF-4526: Elastic bulk error on re-indexing

[mixerka]

Contribution checklist

Brief description

The error we have is "Limit of total fields [1000] has been exceeded while adding new fields [1]". Added this text to error log to make such errors visible.

This is happens in index with a lot of custom fields and is about the amount off custom field names we have overall in one elastic index among all the elastic documents.

Although it is possible just to increase this limit, I would rather prefer not to do that due to performance risks.
And because we do not use actual field name in searching or filtering I suggest to move from field names like 638611f18894c91979399ef3%Источник_6386125d8894c91979399eff to have one custom attribute field and have all custom fields there as nested label-value objects.

Checklist

• - UI test added to added/changed functionality?
• - Screenshot is added to PR if applicable ?
• - Does a local formatting is applied (rush format)
• - Does a local svele-check is applied (rush svelte check)
• - Does a local UI tests are executed UI Testing
• - Does the code work? Check whether function and logic are correct.
• - Does Changelog.md is updated with changes?
• - Does the translations are up to date?
• - Does it well tested?
• - Tested for Chrome.
• - Tested for Safari.
• - Go through the changed code looking for typos, TODOs, commented LOCs, debugging pieces of code, etc.
• - Rebase your branch onto master and upstream branch
• - Is there any redundant or duplicate code?
• - Are required links are linked to PR?
• - Does new code is well documented ?

Related issues

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Contributor requirements

• - Sign-off is provided. DCO
• - GPG Signature is provided. GPG