Malformed regular expression file; should continue with ‘field_name’ after ‘array’ – 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 ” malformed regular expression file; should continue with ‘field_name’ after ‘array’ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Node.

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 “malformed regular expression file; should continue with ‘field_name’ after ‘array'”classname  is UserAgentParser.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

while (token == XContentParser.Token.START_OBJECT) {
 token = yamlParser.nextToken(); 
 if (token != XContentParser.Token.FIELD_NAME) {
 throw new ElasticsearchParseException("malformed regular expression file; should continue with 'field_name' after 'array'");
 } 
 Map regexMap = new HashMap<>();
 for (; token == XContentParser.Token.FIELD_NAME; token = yamlParser.nextToken()) {
 String fieldName = yamlParser.currentName();

 

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