refactor(opensearch): Add Error Handling for Empty Query and Filters in Request

[Abhitator216]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Implement a validation check that ensures the query field is not empty or consisting only of whitespace, and that the filters field is not entirely None or containing only None values for all its fields. If both conditions are true, an error should be returned.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

curl 'http://localhost:8080/analytics/v1/search' \
  -H 'sec-ch-ua: "Not/A)Brand";v="8", "Chromium";v="126", "Google Chrome";v="126"' \
  -H 'sec-ch-ua-mobile: ?0' \
  -H 'authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoiNTEzYWUyODItN2I1NS00MGMwLWFiZGMtYjdiMGYzNDNkMTQ2IiwibWVyY2hhbnRfaWQiOiJtZXJjaGFudF8xNzIxNjQyOTczIiwicm9sZV9pZCI6Im9yZ19hZG1pbiIsImV4cCI6MTcyMjE1NzQ0Miwib3JnX2lkIjoib3JnX2drZHNlNDBIdGx6RkNob2NpU0NzIn0.Fmrxsp-emKQ-67EpcJolMf7EyeDdjl4DcwbmnVSprMU' \
  -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36' \
  -H 'Content-Type: application/json' \
  -H 'Referer: http://localhost:9000/' \
  -H 'api-key: hyperswitch' \
  -H 'sec-ch-ua-platform: "macOS"' \
  --data-raw '{"query":"dvs"}'

• An empty query with an unknown filter produces an error.
• An empty filter with whitespaces in the query produces an error.
• An empty query with a known filter should give results.

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible