elastic/elasticsearch

Consider deprecating/ removing support for wildcards in `term` queries on `_index`.

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#34,162 opened on Sep 28, 2018

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Description

When evaluating a terms query against the _index field, simple wildcard patterns are accepted: https://gist.github.com/jtibshirani/7992dc355b677e8537c333616d3c0270

This is not a huge problem because index names can't contain asterisks, but I think it's confusing and not consistent with the normal behavior of terms queries. It would be good to consider deprecating + removing this ability. We support wildcard queries on the _index field, so the behavior could be changed without a regression in functionality.

Contributor guide

Research direction
Investigate the handling of term queries on the index field. Identify the code that accepts wildcard patterns in term queries on index. Plan deprecation warning and eventual removal, ensuring wildcard query still supports the same functionality. Follow the existing deprecation patterns in the codebase.
Tech stack
java
Domain
backendapi
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJava
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60