public Builder setBootOption(com.google.cloud.vmmigration.v1.ComputeEngineBootOption value) {
      if (value == null) {
        throw new NullPointerException();
      }
      bitField0_ |= 0x00004000;
      bootOption_ = value.getNumber();
      onChanged();
      return this;
    }
<pre>
Output only. The VM Boot Option, as set in the source vm.
</pre>

<code>
.google.cloud.vmmigration.v1.ComputeEngineBootOption boot_option = 15 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>

@param value The bootOption to set.
@return This builder for chaining.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/ComputeEngineTargetDefaults.java