public String getInstanceId() {
        return this.instanceId;
    }
<p>
The unique identifier for the instance where the game server is running. This ID is available in the instance
metadata. EC2 instance IDs use a 17-character format, for example: <code>i-1234567890abcdef0</code>.
</p>

@return The unique identifier for the instance where the game server is running. This ID is available in the
        instance metadata. EC2 instance IDs use a 17-character format, for example:
        <code>i-1234567890abcdef0</code>.
aws-java-sdk-gamelift/src/main/java/com/amazonaws/services/gamelift/model/GameServerInstance.java