AI-generated Key Takeaways
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The operation can be either creating or updating a user list.
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The
update_maskfield uses a FieldMask to determine which resource fields are modified during an update. - 
          
The
operationfield can be one of three types:create,update, orremove. - 
          
A
createoperation does not require a resource name for the new user list, while anupdateoperation requires a valid resource name. - 
          
A
removeoperation requires a resource name in the formatcustomers/{customer_id}/userLists/{user_list_id}. 
A single operation (create, update) on a user list.
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                   FieldMask that determines which resource fields are modified in an update.  | 
              
Union field 
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                   Create operation: No resource name is expected for the new user list.  | 
              
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                   Update operation: The user list is expected to have a valid resource name.  | 
              
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 Remove operation: A resource name for the removed user list is expected, in this format: 
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