public Builder clearExecution() {
      bitField0_ = (bitField0_ & ~0x00000002);
      execution_ = null;
      if (executionBuilder_ != null) {
        executionBuilder_.dispose();
        executionBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. Execution to be created.
</pre>

<code>
.google.cloud.workflows.executions.v1.Execution execution = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workflow-executions/proto-google-cloud-workflow-executions-v1/src/main/java/com/google/cloud/workflows/executions/v1/CreateExecutionRequest.java