What to use doing an insert/update to a specific keyword/keywords in a document?

[Druva_Sheel_Sud]

Using a PUT call, the complete payload and all the keyword values for the document is added/updated/deleted. Is there a way where we can only update specific keywords for the document. 

[Eric_Maerz]

The following statement can be found in the REST API documentation:

The endpoint used to do Keyword modification is a PUT on /documents/{documentId}/keywords. Keyword Modification is only supported by passing the entire collection of Keywords into this request. Therefore any Keyword Objects or Keyword Groups not included in the request will result in their deletion.

[Druva_Sheel_Sud]

Right, is there a different way to restrict and not passing the entire collection for data integrity purpose? Something like PATCH/POST.