elastic/elasticsearch

Add columns CAT Shards for _tier_preference and node.roles

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#136 895 ouverte le 21 oct. 2025

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 (8 commentaires) (0 réactions) (0 assignés)Java (76 700 stars) (25 882 forks)batch import
:Core/Infra/CAT APIs>enhancementTeam:Core/Infragood first issue

Description

Description

👋 howdy!

Hopefully this avoids the XPack-vs-commercial issues surfaced in https://github.com/elastic/elasticsearch/issues/37499. (XY Problem:) I'd like to streamline investigating assigned shard allocation issues related to ILM. As part of flow after https://github.com/elastic/elasticsearch/pull/99612 or Health Report telling you indices are flagged stagnant on migrations.

As part of this, I'd like if CAT Shards would report columns

In practice, I usually flag via an aggregated view and then review a table of what'd be the above similar output. For example when cold backs up warm backs up hot:

TIA!

Guide contributeur

Stack technique
java
Domaine
backendapi
Type d'issue
feature
DifficultéDifficulté estimée pour un nouveau contributeur, de 1 pour un très petit changement à 5 pour un travail expert.
3
Temps estiméFourchette de temps approximative pour investiguer, implémenter, tester et préparer une pull request.
1-3 hours
Statut d'activitéDisponibilité apparente de l'issue : fraîche, active, ancienne, bloquée ou en attente d'un mainteneur.
fresh
ClartéClarté avec laquelle l'issue explique le changement attendu, les critères d'acceptation et la prochaine étape.
mostly clear
Prérequis
Familiarity with Elasticsearch CAT APIBasic knowledge of Java and Elasticsearch codebase
Accessibilité débutantScore de 1 à 100 estimant l'accessibilité de cette issue pour un premier contributeur.
60
Direction de recherche
The issue requests adding two columns (tier preference and node.roles) to the CAT shards API response. Look at the CAT shards action implementation, likely in the 'cat' module. The response format is defined in a class like RestCatShardsAction or similar. Adding columns requires updating the response builder and possibly the parsing logic. Check existing columns for reference. There is a linked issue #37499 for context on XPack vs commercial nuances. No open PRs; this is a good first task for understanding CAT API internals.