public Builder clearIndex() {
      bitField0_ = (bitField0_ & ~0x00000004);
      index_ = null;
      if (indexBuilder_ != null) {
        indexBuilder_.dispose();
        indexBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. The index being created.
</pre>

<code>.google.cloud.visionai.v1.Index index = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/CreateIndexRequest.java