Add the track_total_hits option to the query

[milk1000cc]

Return the accurate total hits.

More here: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-your-data.html#track-total-hits

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the changelog if the new code introduces user-observable changes. See changelog entry format for details.

[rabotyaga]

Hey @milk1000cc 👋 !
Thank you very much!
Could you please modify a little bit the CHANGELOG line? Something along https://github.com/toptal/chewy/pull/802/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4edR7

[milk1000cc]

CHANGELOG updated.