This plugin will help you to check whether you can upgrade directly to the next major version of Elasticsearch, or whether you need to make changes to your data and cluster before doing so.
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Should we flag safeguards that have been exceeded? #67
clintongormley
commented
8 years ago
For example, if a user has a large shard count (https://github.com/elastic/elasticsearch/pull/17396), a large number of fields in their mapping (https://github.com/elastic/elasticsearch/pull/17357), a large number of nested fields (https://github.com/elastic/elasticsearch/issues/14983), or a very high depth in their mappings (https://github.com/elastic/elasticsearch/pull/17400), they may switch over to 5.0 and have unexpected results. We could detect this in the migration assistant prior to the upgrade and provide some help.