@Override
    public String toString() {
        return name().toLowerCase(Locale.ROOT);
    }
Return the enum that corresponds to the Connect protocol version that is given as an argument;
if no mapping is found {@code IllegalArgumentException} is thrown.

@param protocolVersion the version of the protocol; for example,
{@link ConnectProtocol#CONNECT_PROTOCOL_V0 CONNECT_PROTOCOL_V0}. May not be null
@return the enum that corresponds to the protocol compatibility mode
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/ConnectProtocolCompatibility.java