[BUG] FalkorDB vector store from_existing_graph method bug

[galshubeli]

The from_existing_graph method of falkordb_vector under vectorstores concatenates text only from the text property, and not from the text_node_properties list.

https://github.com/langchain-ai/langchain-community/blob/7414609c4e41e9304fdaed22fe9ef3314d36d073/libs/community/langchain_community/vectorstores/falkordb_vector.py#L1131C9-L1131C28

[onestardao]

It seems from_existing_graph is concatenating only the text field, ignoring other node properties listed in text_node_properties.
If your graph stores semantically important fields outside text, this would silently drop context and hurt downstream vector search accuracy.

Quick check:

Confirm whether text_node_properties is passed and populated when calling from_existing_graph.

If yes, the method should iterate through that list and concatenate all matching property values before embedding.

If no, you might need to explicitly pass it or patch the method.

We’ve seen similar issues in other vector store integrations where partial field concatenation caused recall drops of 20–40% in real RAG pipelines, so fixing it early is worth it.

[galshubeli]

#238