private void ensureCriteriaIsMutable() {
      if (!((bitField0_ & 0x00000008) != 0)) {
        criteria_ = new java.util.ArrayList<com.google.cloud.visionai.v1.Criteria>(criteria_);
        bitField0_ |= 0x00000008;
      }
    }
<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 bytes for 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