code: public WriteResult insert(final List<? extends DBObject> documents, final WriteConcern aWriteConcern,
                                @Nullable final DBEncoder dbEncoder) {
          return insert(documents, new InsertOptions().writeConcern(aWriteConcern).dbEncoder(dbEncoder));
      }
docs: Insert documents into a collection. If the collection does not exists on the server, then it will be created. If the new document
  does not contain an '_id' field, it will be added.
  
  @param documents     a list of {@code DBObject}'s to be inserted
  @param aWriteConcern {@code WriteConcern} to be used during operation
  @param dbEncoder     {@code DBEncoder} to be used
  @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 insert command
  @throws MongoException if the operation failed for some other reason
  @mongodb.driver.manual tutorial/insert-documents/ Insert Documents