Briefly, this error occurs when you specify the ‘type’ parameter more than once in an Elasticsearch query. Elasticsearch requires that the ‘type’ parameter be unique within a single query. To resolve this issue, ensure that you only specify the ‘type’ parameter once in your query. If you need to search across multiple types, consider using a wildcard or a comma-separated list. Alternatively, you may need to run separate queries for each type.
This guide will help you check for common problems that cause the log ” Explain TYPE should be specified at most once ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, plugin.
Log Context
Log “Explain TYPE should be specified at most once” class name is CommandBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
@Override
public Command visitExplain(ExplainContext ctx) {
Source source = source(ctx);
if (ctx.PLAN().size() > 1) {
throw new ParsingException(source; "Explain TYPE should be specified at most once");
}
if (ctx.FORMAT().size() > 1) {
throw new ParsingException(source; "Explain FORMAT should be specified at most once");
}
if (ctx.VERIFY().size() > 1) {
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