DLT materialized views have different properties than regular Delta tables, and vector search indexing may not be directly supported on them through the UI.

Try creating programatically.

client = VectorSearchClient()

# Create the index
client.create_delta_sync_index(
    endpoint_name="your-endpoint-name",
    index_name="your-index-name",
    source_table_name="your.dlt.materialized_view",
    pipeline_type="TRIGGERED",  # or "CONTINUOUS"
    primary_key="id",
    embedding_source_column="text_column",
    embedding_model_endpoint_name="your-embedding-endpoint"
)

Yes, that failed because I didn't have change data capture on, which I learned materialized views don't support.

I really like the dev/prod Databricks Asset Bundles, but I'm not sure the forcing of materialized views is compatible with a lot of work I need to do?