Unexpected empty inference response – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Unexpected empty inference response ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response and plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Unexpected empty inference response”classname  is InferenceProcessor.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 void mutateDocument(InternalInferModelAction.Response response; IngestDocument ingestDocument) {
 if (response.getInferenceResults().isEmpty()) {
 throw new ElasticsearchStatusException("Unexpected empty inference response"; RestStatus.INTERNAL_SERVER_ERROR);
 assert response.getInferenceResults().size() == 1;
 response.getInferenceResults().get(0).writeResult(ingestDocument; this.targetField);
 ingestDocument.setFieldValue(targetField + "." + MODEL_ID; modelId);


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