Fix handling of nested fields in OpenSearch query

[yeganathan18]

Changes proposed ✍️

What

🤖 Generated by Copilot at a240668

Added support for nested field queries in Opensearch. Modified FieldTranslator and OpensearchQueryParser classes to detect and handle nested fields in the filters object.
​

🤖 Generated by Copilot at a240668

Nested query added
To filter crowd fields with depth
Autumn leaves nested

Why

How

🤖 Generated by Copilot at a240668

• Add support for nested field queries in Opensearch (link, link)

• Create a new method isNestedField in fieldTranslator.ts to check if a field name starts with nested_ (link)
• Modify parseCrowdFilters in opensearchQueryParser.ts to wrap the query condition for nested fields in a nested query with the correct path and query (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.