Briefly, this error occurs when the Event Query Language (EQL) statement sent to Elasticsearch exceeds the maximum allowed size. This could be due to a complex or lengthy query. To resolve this issue, you can simplify your EQL statement by reducing the number of conditions or splitting it into multiple smaller queries. Alternatively, you can increase the maximum allowed size of EQL statements in your Elasticsearch configuration, but be aware that this could impact performance.
This guide will help you check for common problems that cause the log ” EQL statement is too large; ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, parser.
Log Context
Log “EQL statement is too large;” class name is EqlParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
log.info("Parse tree {} " + tree.toStringTree());
} return visitor.apply(new AstBuilder(params); tree);
} catch (StackOverflowError e) {
throw new ParsingException("EQL statement is too large; " +
"causing stack overflow when generating the parsing tree: [{}]"; eql);
}
} private static void debug(EqlBaseParser parser) {
