Feature Request: Partial Schema Config Update using PATCH

[etiennedi]

The idempotent nature of PUT is sometimes confusing for users. In order to change one prop of a schema, the user needs to first retrieve the schema, make an alteration, then send the schema back to Weaviate. That is correct usage of the PUT verb:

A successful PUT of a given representation would suggest that a subsequent GET on that same target resource will result in an equivalent representation being sent in a 200 (OK) response.
Source: RFC7231

However, it is not the most comfortable way to update a schema. Instead, we could also allow a partial update using PATCH. In this case, the user would only send the property they want to be updated and Weaviate would merge the update with the existing schema.