The vector from GetObject seems wrong with FP16 mode

[vankichi]

Describe the bug:

When running Vald Agent with FP16, the vector in the response of GetObject() seems wrong after createIndex() finished. (Before createIndex() finishes, the vector from GetObject() seems correct.)

To Reproduce:

1. Send insert request
2. Send the get object request before the createIndex function runs.
   • the vector in the response is the same as the request vector.
3. Wait for the createIndex finish.
4. Send the get object request again.
   • the vector in the response is NOT the same as the request vector.

Expected behavior:

The vector I get in step4 is the same as the insert vector.

Environment:

• Go Version: 1.18.3
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.7