Pipe expects a positive integer but found – 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 ” Pipe expects a positive integer but found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser 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 “Pipe [{}] expects a positive integer but found [{}]”classname  is LogicalPlanBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 BooleanExpressionContext limitCtx = exps.get(0);
 Expression expression = expression(limitCtx); 
 if (expression.dataType().isInteger() == false || expression.foldable() == false || (int) expression.fold() < 0) {
 throw new ParsingException(source(limitCtx); "Pipe [{}] expects a positive integer but found [{}]"; pipeName; expression
 return expression;


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