@Override
    public String toString() {
        return "ParsedDocumentOperation[" +
               "operation=" + operation + ", " +
               "fullyApplied=" + fullyApplied + ']';
    }
@param operation    the parsed operation
@param fullyApplied true if all the JSON content could be applied,
                    false if some (or all) of the fields were not poresent in this document and was ignored
document/src/main/java/com/yahoo/document/json/ParsedDocumentOperation.java