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docs: upgrading Elasticsearch chapter #3942

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slint opened this issue May 12, 2019 · 0 comments

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slint commented May 12, 2019

Overview

Rolling restart vs. Full restart
Reindexing and syncing
- Explain how record/document batches/deltas are calculated based on timestamps
Changes to mappings
- Simple scenario: Adding fields with PUT mapping
- Complex scenario: changing types/structure
Online vs offline
- When downtime is necessary
- Implications in terms of old/new system actions order
Data migration and data model evolution

Upgrading indices (in-cluster)

Requirements: Modification timestamp and version counter.

Migrating indices (cross-cluster)

Extra migration controller/worker node setup
Not possible to read from ES (only via Reindex API)
Transformation functions (e.g. ES2 -> ES5 suggestions field changes, or when mapping structure has changed)

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