public Builder mergeMigratingVm(com.google.cloud.vmmigration.v1.MigratingVm value) {
      if (migratingVmBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && migratingVm_ != null
            && migratingVm_ != com.google.cloud.vmmigration.v1.MigratingVm.getDefaultInstance()) {
          getMigratingVmBuilder().mergeFrom(value);
        } else {
          migratingVm_ = value;
        }
      } else {
        migratingVmBuilder_.mergeFrom(value);
      }
      if (migratingVm_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. The create request body.
</pre>

<code>
.google.cloud.vmmigration.v1.MigratingVm migrating_vm = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CreateMigratingVmRequest.java