IllegalStateException for Retriever Query

[john-wagster]

Elasticsearch Version

8.17.2

Installed Plugins

No response

Java Version

bundled

OS Version

NA

Problem Description

Getting the following exception but we don't have a query that can easily reproduce it. Creating at least a placeholder here in case we are able to gather more information on this issue.

java.lang.IllegalStateException: parser for [retrievers] did not end on END_OBJECT
	at org.elasticsearch.xcontent@9.1.0/org.elasticsearch.xcontent.ObjectParser.throwMustEndOn(ObjectParser.java:669)
	at org.elasticsearch.xcontent@9.1.0/org.elasticsearch.xcontent.ObjectParser.parseSub(ObjectParser.java:640)
	at org.elasticsearch.xcontent@9.1.0/org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:316)
	at org.elasticsearch.xcontent@9.1.0/org.elasticsearch.xcontent.ConstructingObjectParser.parse(ConstructingObjectParser.java:167)
	at org.elasticsearch.xcontent@9.1.0/org.elasticsearch.xcontent.ConstructingObjectParser.apply(ConstructingObjectParser.java:159)
	at org.elasticsearch.rank.rrf@9.1.0/org.elasticsearch.xpack.rank.rrf.RRFRetrieverBuilder.fromXContent(RRFRetrieverBuilder.java:81)

Steps to Reproduce

NA

Logs (if relevant)

No response

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)