public void setBuildId(String buildId) {
        this.buildId = buildId;
    }
<p>
The unique identifier for a custom game server build to be deployed to a fleet with compute type <code>EC2</code>
. You can use either the build ID or ARN. The build must be uploaded to Amazon GameLift and in <code>READY</code>
status. This fleet property can't be changed after the fleet is created.
</p>

@param buildId
       The unique identifier for a custom game server build to be deployed to a fleet with compute type
       <code>EC2</code>. You can use either the build ID or ARN. The build must be uploaded to Amazon GameLift
       and in <code>READY</code> status. This fleet property can't be changed after the fleet is created.
aws-java-sdk-gamelift/src/main/java/com/amazonaws/services/gamelift/model/CreateFleetRequest.java