In ​/v1​/document-embedding-status release-number should not take random string

**Description**: 
In ​/v1​/document-embedding-status API's request-body , the release-number is currently without a pattern. This makes the express framework to accept any random string as a release-number.
**Proposal**: 
Proposing to add the below pattern to the "request-body" attribute of the API /v1​/document-embedding-status
 `pattern: "^([0-9]{1,2})\\.([0-9]{1,2})\\.([0-9]{1,2})$"`