PGVector Error: access method "hnsw" does not exist

[renaisser]

Hi Haystack team!

I have the following error when I try to create a docstore with PGVector and hnsw as search_strategy:

document_store = PgvectorDocumentStore(
    table_name="haystack_test",
    embedding_dimension=768,
    vector_function="cosine_similarity",
    recreate_table=True,
    search_strategy="hnsw"
)

the error is:

UndefinedObject: access method "hnsw" does not exist
DocumentStoreError: Could not create HNSW index.

I don't have problems with exact_nearest_neighbor.

any help?

Thanks!

[mrm1001]

Hi there, do you still need help or have you managed to resolve this?