elastic/elasticsearch

Remove the `snowball` analyzer

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#8,690 opened on Nov 27, 2014

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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

Research direction
Understand the removal of the snowball analyzer in Lucene 5.0. Investigate how to automatically upgrade existing indices that use snowball to the english analyzer, and add validation to reject new indices specifying snowball. Trace the index creation and upgrade paths.
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaElasticsearch
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40