[BUG] <The backend Role of the internal user is not working>

[XiaotianZha]

Describe the bug

I have create a new user in internal user and set an existing backend Role. But when I test this new user with fluentBit, I got an error

[opensearch-node1] No permissions for [indices:admin/create]

I have double checked this user has this permission. Fianlly, I mapperd this user by Roles mapperd users, and it's worked

Related component

Other

To Reproduce

1. Go to 'internal user'
2. Click on 'backend Role'
3. Use this user in fluentBit
4. See error

Expected behavior

fix this issue in internal user

Additional Details

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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

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