code: public WriteResult updateMulti(final DBObject query, final DBObject update) {
          return update(query, update, false, true);
      }
docs: Modify documents in collection. The query parameter employs the same query selectors, as used in {@code find()}.
  
  @param query  the selection criteria for the update
  @param update the modifications to apply
  @return the result of the operation
  @throws com.mongodb.DuplicateKeyException if the write failed to a duplicate unique key
  @throws com.mongodb.WriteConcernException if the write failed due some other failure specific to the update command
  @throws MongoException if the operation failed for some other reason
  @mongodb.driver.manual tutorial/modify-documents/ Modify Documents