private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmmigration.v1.TargetProject,
            com.google.cloud.vmmigration.v1.TargetProject.Builder,
            com.google.cloud.vmmigration.v1.TargetProjectOrBuilder>
        getTargetProjectFieldBuilder() {
      if (targetProjectBuilder_ == null) {
        targetProjectBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmmigration.v1.TargetProject,
                com.google.cloud.vmmigration.v1.TargetProject.Builder,
                com.google.cloud.vmmigration.v1.TargetProjectOrBuilder>(
                getTargetProject(), getParentForChildren(), isClean());
        targetProject_ = null;
      }
      return targetProjectBuilder_;
    }
<pre>
Required. The update request body.
</pre>

<code>
.google.cloud.vmmigration.v1.TargetProject target_project = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/UpdateTargetProjectRequest.java