Expected a string but found instead – Elasticsearch Error How To Solve Related Issues

Expected a string but found instead – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

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


This guide will help you check for common problems that cause the log “Expected a string but found instead” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: .

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”Expected a string but found [{}] instead”classname  is TaskId.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public static ContextParser parser() {
  return (p; c) -> {
  if (p.currentToken() == XContentParser.Token.VALUE_STRING) {
  return new TaskId(p.text());
  throw new ElasticsearchParseException("Expected a string but found [{}] instead"; p.currentToken());
  public String getNodeId() {
  return nodeId;

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 GSON throwing "Expected BEGIN_OBJECT but was BEGIN_ARRAY"? -views 421,125 ,score 296

TypeError: sequence item 0: expected string, int found -views   278,411,score 185

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