Required. The field paths to update. Currently supported field paths:
lastReadTime
When the lastReadTime is before the latest message create time, the space appears as unread in the UI.
To mark the space as read, set lastReadTime to any value later (larger) than the latest message create time. The lastReadTime is coerced to match the latest message create time. Note that the space read state only affects the read state of messages that are visible in the space's top-level conversation. Replies in threads are unaffected by this timestamp, and instead rely on the thread read state.
Request body
The request body contains an instance of SpaceReadState.
Response body
If successful, the response body contains an instance of SpaceReadState.