The response from /{db}/_design/{ddoc}/_info contains view_index (object) field with the next structure:
- compact_running (boolean): Indicates whether a compaction routine is currently running on the view
- sizes.active (number): The size of live data inside the view, in bytes
- sizes.external (number): The uncompressed size of view contents in bytes
- sizes.file (number): Size in bytes of the view as stored on disk
- language (string): Language for the defined views
- purge_seq (number): The purge sequence that has been processed
- signature (string): MD5 signature of the views for the design document
- update_seq (number / string): The update sequence of the corresponding database that has been indexed
- updater_running (boolean): Indicates if the view is currently being updated
- waiting_clients (number): Number of clients waiting on views from this design document
- waiting_commit (boolean): Indicates if there are outstanding commits to the underlying database that need to processed