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Milvus "index not exist" Error

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Workaround available All Updated November 15, 2026Based on 2 user reportsHow we research

Quick answer

Milvus does not auto-create the vector index. Call create_index on the vector field, then load.

Most likely fix: Create the index

How to fix it

Try these in order — the most common fix is first.

  1. 1. Create the index

    1. client.create_index() on the vector field
    2. AUTOINDEX lets Milvus choose based on data size
    3. Then load_collection
    Did this fix it?

Symptoms

MilvusException (code=15) index not exist.

Why it happens

  • No index created on the vector field
  • Loading before indexing

This guide also covers

  • milvus index not exist
  • milvus create index error

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