Sequence fork is unsupported – Elasticsearch Error How To Solve Related Issues

Sequence fork is unsupported – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 


This guide will help you check for common problems that cause the log “sequence fork is unsupported” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: parser, plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”sequence fork is unsupported”classname  is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

return new Sequence(source; queries; until; maxSpan; fieldTimestamp(); fieldTiebreaker(); defaultDirection());
  public KeyedFilter visitSequenceTerm(SequenceTermContext ctx; List joinKeys) {
  if (ctx.FORK() != null) {
  throw new ParsingException(source(ctx.FORK()); "sequence fork is unsupported");
  return keyedFilter(joinKeys; ctx;; ctx.subquery());

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Unreported exception java.lang.Exception; must be caught or declared to be thrown -views 46,696 ,score 5

incompatible types: java.lang.Object cannot be converted to java.lang.String? -views   16,891,score 2

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