elastic/elasticsearch

Remove the `snowball` analyzer

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#8690 opened on Nov 27, 2014

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:Search Relevance/Analysis>breakingTeam:Search Relevancehelp wanted

Description

The snowball analyzer has been removed in Lucene 5.0 in favour of the english language analyzer.

In 2.0, we should automatically upgrade indices which use it to use the english analyzer instead, and refuse to create new indices which specify the snowball analyzer.

Contributor guide

Tech stack
java
Domain
backend
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.
1-2 days
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.
mostly clear
Prerequisites
JavaElasticsearch analyzer system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Examine the current Elasticsearch codebase to locate where analyzers are defined and how index creation handles deprecated analyzers. Look for any existing upgrade path or similar removals. Check issue comments and linked PRs for prior attempts or decisions. Determine the scope of changes needed in both index creation and upgrade logic, and identify relevant test files.