Page History

{
   _id : { <BSON Object> },        // Identifier for the opened change stream, can be assigned as a value to the resumeAfter parameter to resume this change stream later.
   "operationType" : "<operation>",        // The type of change operation that occurred, e.g., insert, delete, update, etc.
   "fullDocument" : { <document> },      // The complete document data involved in the change operation; not present in delete operations.
   "ns" : {   
      "db" : "<database>",         // The database where the change operation occurred.
      "coll" : "<collection>"     // The collection where the change operation occurred.
   },
   "to" : {   // Displayed only for rename operations.
      "db" : "<database>",         // The new database name after the change.
      "coll" : "<collection>"     // The new collection name after the change.
   },
   "documentKey" : { "_id" : <value> },  // The value of the _id field of the document involved in the change operation.
   "updateDescription" : {    // Description of the modification operation.
      "updatedFields" : { <document> },  // The fields that were modified and their new values.
      "removedFields" : [ "<field>", ... ]     // The fields that were removed and their values in the modification operation.
   }
   "clusterTime" : <Timestamp>,     // The timestamp from the Oplog entry associated with the change operation.
   "txnNumber" : <NumberLong>,    // If the change operation was executed within a multi-document transaction, this field indicates the transaction number.
   "lsid" : {          // Information about the session related to the transaction.
      "id" : <UUID>,  
      "uid" : <BinData> 
   }
}