Maestro V5 - Elasticsearch compatibility

[leoraba]

Part of #279

Summary of request

Compatible with Elasticsearch V7 and V8.

Details

The service should be designed to be fully compatible with both Elasticsearch version 7 and version 8, providing a flexible and scalable solution for various data indexing and search operations.

Desired solution

• The service allows users to specify which Elasticsearch version to use through environment variables. e.g. MAESTRO_ELASTICSEARCH_VERSION
• Allow users to specify Elasticsearch Auth mechanismh (basicAuth, apiKey, disabled) and provide credentials
• Allow users to set ElasticSearch additional configurations (retries, wait duration, timeout, etc).
• Ability to use Bulk updates to reduce the number of individual API calls made to Elasticsearch. Configure the number of docs per bulk.
• Client abstraction. Maestro client should abstract the complexity of managing multiple versions and provide consistent functions while internally it should handle different elasticsearch versions.