Pipe expects exactly one argument 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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Pipe expects exactly one argument but found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser and plugin.

Log Context

Log “Pipe [{}] expects exactly one argument but found [{}]”classname  is LogicalPlanBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 private Expression pipeIntArgument(Source source; String pipeName; List exps) {
 int size = CollectionUtils.isEmpty(exps) ? 0 : exps.size();
 if (size != 1) {
 throw new ParsingException(source; "Pipe [{}] expects exactly one argument but found [{}]"; pipeName; size);
 BooleanExpressionContext limitCtx = exps.get(0);
 Expression expression = expression(limitCtx); 
 if (expression.dataType().isInteger() == false || expression.foldable() == false || (int) expression.fold() < 0) {


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