[FEATURE] Neo4j Integration Improvements List

[jexp]

As part of the Neo4j integration in langchain4j community we want to improve the base functionality.

Neo4jGraph

• Switch to driver.executeQuery to automatically get retries
• Combine metadata retrieval into one query
• Add option for enhanced schema with sample property values
• Integration test for invalid query
• Fixing generated queries, e.g. relationship-direction (e.g. with cypher-dsl)

Neo4jContentRetriever

• Rename to Neo4jText2CypherContentRetriever
• Re-generate with the question, query, error and re-run failed generated queries
• Integration test for invalid query
• Add a more comprehensive integration test with a bit more complex schema e.g. northwind?

Neo4j Vector Support

• Add Hybrid Search with re-ranker, fulltext index generation
• Add GraphRAG retrieval concepts
• Support parent-child and entity-retrievers

Documentation & Examples

• Document the existing and new features in more detail
• Extend the example code repository with more practical examples

Graph Construction

• LLMGraphTransformer equivalent
• Provide GraphSchema from user or from Neo4jGraph
• Prompt for entity extraction
• Graph representation as response
• Process Documents with LLM + Prompt + structured output
• Allow Neo4jGraph to store graph representation response directly and efficiently (batched)

Graphs As Conversation / Agent Memory

• Integrate Neo4j as storage for conversation history / memory similar to LC
• Add agentic memory integration when possible