neo4j-labs/genkitx-neo4j ? reverse-engineered prompt

Build me a TypeScript plugin for Genkit that connects to Neo4j and lets me store and search embedded documents with vector indexing and retrieval.

I want to be able to configure a Neo4j connection with environment variables for the URI, username, and password, then register one or more indexes by name with an embedder. After that, I should be able to create an indexer ref and pass documents into Genkit to save them, and create a retriever ref to query the same data back with a natural language search.

Please make the usage feel simple and match the Genkit style, with a clean plugin function plus helpers for indexers and retrievers. It should work like a normal npm package I can install and import in a Genkit app. If you need to check current Genkit or Neo4j docs while wiring it up, feel free to look them up online.