Labels hint supports either string value or list of strings

Labels hint supports either string value or list of strings – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.3-8.9

Briefly, this error occurs when the “labels” field in Elasticsearch is given a data type that it doesn’t support. The “labels” field only supports string values or a list of strings. If you’re trying to input a different data type, such as an integer or a boolean, you’ll encounter this error. To resolve this issue, ensure that the data you’re inputting into the “labels” field is either a single string or a list of strings. If the data is in a different format, you may need to convert it to a string before inputting it.

This guide will help you check for common problems that cause the log ” [labels] hint supports either string value or list of strings ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[labels] hint supports either string value or list of strings” class name is SuggestProfilesRequest.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final ArrayList values = new ArrayList<>();
 for (Object v : listValue) {
 if (v instanceof final String stringValue) {
 values.add(stringValue);
 } else {
 throw new ElasticsearchParseException("[labels] hint supports either string value or list of strings");
 }
 }
 labels.put(entry.getKey(); List.copyOf(values));
 } else {
 throw new ElasticsearchParseException("[labels] hint supports either string or list of strings as its value");

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