A character not a string required for escaping; found – Elasticsearch Error How To Solve Related Issues



A character not a string required for escaping; found – 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 “A character not a string required for escaping; found” 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: parser, plugin.


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”A character not a string required for escaping; found [{}]”classname  is ExpressionBuilder.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

String escapeString = escapeCtx == null ? null : string(escapeCtx.escape);
 
  if (Strings.hasText(escapeString)) {
  // shouldn't happen but adding validation in case the string parsing gets wonky
  if (escapeString.length() > 1) {
  throw new ParsingException(source(escapeCtx); "A character not a string required for escaping; found [{}]"; escapeString);
  } else if (escapeString.length() == 1) {
  escape = escapeString.charAt(0);
  // these chars already have a meaning
  if (escape == '*' || escape == '%' || escape == '_') {
  throw new ParsingException(source(escapeCtx.escape); "Char [{}] cannot be used for escaping"; escape);

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 Elastic Search Hyphen issue with term filter -views 31,341 ,score 50

Do reserved characters need to be escaped in an Elasticsearch query? -views   9,380,score 3



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