[DEV-11931] Implement OpenSearch client over ElasticSearch

[DavidMikolaKC]

Description:

The USAspending API still uses Elasticsearch hosted by AWS. AWS made the switch to their own implementation known as OpenSearch and no longer updates Elasticsearch leaving the latest available version at 7.1. In aiming to use packages that officially support our current Python version we should make the switch to OpenSearch client and DSL.

Technical Details:

All imports of Elasticsearch have been replaced with the equivalent imports from the opensearch-py library

Requirements for PR Merge:

All functionalities are retained from how they operated in Elasticsearch

1. Unit & integration tests updated
2. API documentation updated (examples listed below)
   1. API Contracts
   2. API UI
   3. Comments
3. Data validation completed (examples listed below)
   1. Does this work well with the current frontend? Or is the frontend aware of a needed change?
   2. Is performance impacted in the changes (e.g., API, pipeline, downloads, etc.)?
   3. Is the expected data returned with the expected format?
4. Appropriate Operations ticket(s) created
5. Jira Ticket(s)
   1. DEV-0

Explain N/A in above checklist: