public Builder clearAwsRegion() {
      awsRegion_ = getDefaultInstance().getAwsRegion();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Immutable. The AWS region that the source VMs will be migrated from.
</pre>

<code>string aws_region = 3 [(.google.api.field_behavior) = IMMUTABLE];</code>

@return This builder for chaining.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/AwsSourceDetails.java