public com.google.cloud.vertexai.api.MachineSpec.Builder getMachineSpecBuilder() {
      bitField0_ |= 0x00000001;
      onChanged();
      return getMachineSpecFieldBuilder().getBuilder();
    }
<pre>
Required. Immutable. The specification of a single machine.
</pre>

<code>
.google.cloud.vertexai.v1.MachineSpec machine_spec = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.field_behavior) = IMMUTABLE];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/BatchDedicatedResources.java