Could not read search request. unexpected string field – 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 ” could not read search request. unexpected string field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: request, search 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 “could not read search request. unexpected string field [“classname  is WatcherSearchTemplateRequest.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

} else if (SEARCH_TYPE_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 searchType = SearchType.fromString(parser.text().toLowerCase(Locale.ROOT));
 } else if (REST_TOTAL_HITS_AS_INT_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 totalHitsAsInt = parser.booleanValue();
 } else {
 throw new ElasticsearchParseException("could not read search request. unexpected string field [" +
 currentFieldName + "]");
 }
 } else if (token == XContentParser.Token.VALUE_BOOLEAN) {
 if (REST_TOTAL_HITS_AS_INT_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 totalHitsAsInt = parser.booleanValue();

 

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