code: public static CouchbaseOperation getOperation(Configuration hadoopConfiguration) throws ArgsException {
      String strCouchbaseOperation = hadoopConfiguration.get(ARG_OPERATION.getPropertyName());
  
      // Default value
      if (strCouchbaseOperation == null) {
        return CouchbaseOperation.SET;
      }
  
      try {
        return CouchbaseOperation.valueOf(strCouchbaseOperation);
      } catch (IllegalArgumentException e) {
        throw new ArgsException("Unrecognized store type '" + strCouchbaseOperation +
          "'. Please provide one of the following: SET, ADD, REPLACE, APPEND, PREPEND and DELETE.", e);
      }
    }
docs: Reads Couchbase store operation from the Hadoop configuration type.
  @param hadoopConfiguration Hadoop Configuration
  @return Couchbase store operation to be used
  @throws ArgsException in case of wrong arguments