public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }
<pre>
Immutable. A resource name of the IndexEndpoint.
</pre>

<code>
string index_endpoint = 1 [(.google.api.field_behavior) = IMMUTABLE, (.google.api.resource_reference) = { ... }
</code>

@return The bytes for indexEndpoint.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/DeployedIndexReference.java