public void setMessageId(String messageId) {
        this.messageId = messageId;
    }
<p>
The unique identifier for the message.
</p>

@param messageId
       The unique identifier for the message.
aws-java-sdk-pinpointsmsvoicev2/src/main/java/com/amazonaws/services/pinpointsmsvoicev2/model/SendTextMessageResult.java