[ES|QL] CCS index with quotes fails

[stratoula]

Elasticsearch Version

8.16

Installed Plugins

No response

Java Version

bundled

OS Version

Darwin Kernel Version 22.6.0

Problem Description

When we are wrapping a CCS index with quotes it fails with "Invalid index name: must not contain :"

Wrapping a normal index with quotes works fine so this is a weird behavior. Also the error is confusing. CCS indexes are described with :

Steps to Reproduce

1. Ensure that you have a CCS index
2. Use the esql api to query this index with quotes : from "remote_cluster:index"

Logs (if relevant)

No response

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[elasticsearchmachine]

Pinging @elastic/kibana-esql (ES|QL-ui)

[alex-spies]

@fang-xing-esql , this looks like it's related to #112081; do you wanna take a look?

[bpintea]

From the FROM docs:

Use enclosing double quotes (") or three enclosing double quotes (""") to escape index names that contain special characters:

FROM "this=that", """this[that"""

Whatever is in quotes in the FROM is considered an index pattern only (i.e. excluding a remote cluster name). If one needs to quote the name of the index pattern, but use a remote cluster name, that would look like FROM remoteCluster:"this=that".

So I think the failure is valid and correct.

[stratoula]

Hey Bogdan. I think that this was working before and I personally find this FROM remoteCluster:"this=that" a very confusing syntax 🤷‍♀

[bpintea]

I think that this was working before

I see. That probably happened unintentional, though given that : can't be part of an index name, supporting it intentionally should be possible.