This section discusses the changes that you need to be aware of when migrating your application to Elasticsearch 5.0.
(compatible with Elasticsearch 2.3.0 and above) will help you to find issues
that need to be addressed when upgrading to Elasticsearch 5.0.
Indices created before 5.0edit
Elasticsearch 5.0 can read indices created in version 2.0 or above. An Elasticsearch 5.0 node will not start in the presence of indices created in a version of Elasticsearch before 2.0.
Reindex indices from Elasticseach 1.x or before
Indices created in Elasticsearch 1.x or before will need to be reindexed with
Elasticsearch 2.x or 5.x in order to be readable by Elasticsearch 5.x. It is not
sufficient to use the
upgrade API. See Reindex to upgrade for more details.
The first time Elasticsearch 5.0 starts, it will automatically rename index folders to use the index UUID instead of the index name. If you are using shadow replicas with shared data folders, first start a single node with access to all data folders, and let it rename all index folders before starting other nodes in the cluster.