public Builder setIndexEndpoint(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      indexEndpoint_ = value;
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
Required. The index endpoint to search.
Format:
`projects/{project_id}/locations/{location_id}/indexEndpoints/{index_endpoint_id}'
</pre>

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

@param value The indexEndpoint to set.
@return This builder for chaining.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/SearchIndexEndpointRequest.java