Add string-based filter deletion alongside the Filter.Expression-based deletion
for Neo4j and OpenSearch vector stores, providing consistent deletion capabilities
with other vector store implementations.
Key changes:
- Add delete(Filter.Expression) implementation for Neo4j store using Cypher queries
- Add delete(Filter.Expression) implementation for OpenSearch store using query_string
- Leverage existing filter expression converters for both stores
- Use Neo4j's transaction batching for efficient large-scale deletions
- Use OpenSearch's delete_by_query API for metadata-based deletion
- Add comprehensive integration tests for both stores covering:
* Simple equality filters
* String-based filter expressions
* Complex filter expressions with multiple conditions
This maintains consistency with other vector store implementations while utilizing
store-specific features for efficient metadata-based deletion.
Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>
07b905896a