Briefly, this error occurs when the Debug FORMAT in Elasticsearch is specified more than once. This is a configuration issue where the system is unable to process multiple instances of the same parameter. To resolve this, you should check your Elasticsearch configuration files and scripts to ensure that the Debug FORMAT is only specified once. If it appears multiple times, remove the duplicates. Also, ensure that the Debug FORMAT is correctly defined according to the Elasticsearch documentation.
This guide will help you check for common problems that cause the log ” Debug FORMAT 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 “Debug FORMAT 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 visitDebug(DebugContext ctx) {
Source source = source(ctx);
if (ctx.FORMAT().size() > 1) {
throw new ParsingException(source; "Debug FORMAT should be specified at most once");
}
if (ctx.PLAN().size() > 1) {
throw new ParsingException(source; "Debug PLAN should be specified at most once");
}
