WeaviateQueryError when using JS/TS client to query named vectors - class has multiple vectors, but no target vectors were provided

Description

Hello, I’m using Weaviate Cloud for my RAG application and recently ran into this error after upgrading to version 1.26.7 that never occurred using earlier versions:

WeaviateQueryError: Query call with protocol gRPC failed with message: /weaviate.v1.Weaviate/Search UNKNOWN: extract target vectors: class <class_name> has multiple vectors, but no target vectors were provided
at /var/task/node_modules/weaviate-client/dist/node/cjs/grpc/searcher.js:43:19
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async getKeywords (/var/task/index.js:58:26)
at async Promise.all (index 0)
at async exports.handler (/var/task/index.js:166:40)

My collection was created using:

collection = client.collections.create(
    name="<class_name>",
    properties=[
        wc.Property(name="text", data_type=wc.DataType.TEXT),
        wc.Property(name="keywords", data_type=wc.DataType.TEXT),
    ],
    vectorizer_config=[
        wc.Configure.NamedVectors.text2vec_openai(
            name="text", source_properties=["text"]
        ),
        wc.Configure.NamedVectors.text2vec_openai(
            name="keywords", source_properties=["keywords"]
        ),
    ],
    generative_config=wvc.config.Configure.Generative.openai()
)

After inserting documents, I can make queries without issue on the Python client using:

response = collection.generate.near_text(
    query=question,
    target_vector="keywords",
    limit=5,
    grouped_task = "<task_prompt>"
)

However, I’m using weaviate-client in Node.js and running into the error above now even though the query worked fine in earlier Weaviate versions. JS usage:

const response = await collection.generate.nearText(
    query, {
        groupedTask: `<task_prompt>`,
        limit: 5,
        targetVector: "keywords"
})

When I remove the target_vector keyword from the Python script, I run into a similar error:

AioRpcError: <AioRpcError of RPC that terminated with:
	status = StatusCode.UNKNOWN
	details = "extract target vectors: class UMMS has multiple vectors, but no target vectors were provided"
	debug_error_string = "UNKNOWN:Error received from peer  {grpc_message:"extract target vectors: class UMMS has multiple vectors, but no target vectors were provided", grpc_status:2, created_time:"2024-10-24T20:54:53.071755673+00:00"}"
>

I’m not sure how to fix this issue. I’ve upgraded weaviate-client to 3.1.5 and 3.2.0 and still running into this error. Any insight would be helpful, thank you.

Server Setup Information

• Weaviate Server Version: 1.26.7
• Deployment Method: Weaviate Cloud
• Multi Node? Number of Running Nodes:
• Client Language and Version: JavaScript v3.0.9, v3.1.5, v3.2.0
• Multitenancy?:

Any additional Information