How to index vector fields for semantic search in sql server azure

CREATE VECTOR INDEX idx_OpenAIEmbedding

ON dbo.table_name (OpenAIEmbedding)

WITH (

VECTOR_DIMENSION = 1536, -- Assuming OpenAI embedding dimension

SIMILARITY_FUNCTION = 'COSINE'

);

Started executing query at Line 1

Msg 343, Level 15, State 2, Line 1

Unknown object type 'VECTOR' used in a CREATE, DROP, or ALTER statement.

Msg 155, Level 15, State 1, Line 4

'VECTOR_DIMENSION' is not a recognized CREATE VECTOR INDEX option.

Msg 153, Level 15, State 1, Line 4

Invalid usage of the option VECTOR_DIMENSION in the INDEX statement.

Total execution time: 00:00:00.664