Google: Gmail users threads schemas

3 Google schemas with complete fields and constraints.

Field	Type	Presence	Description and constraints
`$`	object	Root	A collection of messages representing a conversation.
`historyId`	string	Optional	The ID of the last history record that modified this thread. Format: uint64
`id`	string	Optional	The unique ID of the thread.
`messages`	array	Optional	The list of messages in the thread.
`messages[]`	Model	Each item	Expand Gets the specified message — response body
`snippet`	string	Optional	A short part of the message text.

Field	Type	Presence	Description and constraints
`$`	object	Root
`nextPageToken`	string	Optional	Page token to retrieve the next page of results in the list.
`resultSizeEstimate`	JSON	Optional
`resultSizeEstimate (anyOf 1)`	integer	Alternative	Estimated total number of results. Format: uint32
`resultSizeEstimate (anyOf 2)`	string	Alternative	Pattern: ^-?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?$
`threads`	array	Optional	List of threads. Note that each thread resource does not contain a list of `messages`. The list of `messages` for a given thread can be fetched using the [`threads.get`](https://developers.google.com/workspace/gmail/api/v1/reference/users/threads/get) method.
`threads[]`	Model	Each item	Expand Gets the specified thread For more information, see Manage threads (https: developers google com workspace gmail api guides threads) — response body

Field	Type	Presence	Description and constraints
`$`	object	Root
`addLabelIds`	array	Optional	A list of IDs of labels to add to this thread. You can add up to 100 labels with each update.
`addLabelIds[]`	string	Each item
`removeLabelIds`	array	Optional	A list of IDs of labels to remove from this thread. You can remove up to 100 labels with each update.
`removeLabelIds[]`	string	Each item