OpenSearch/docs/reference/migration/migrate_7_3.asciidoc

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[[breaking-changes-7.3]]
== Breaking changes in 7.3
++++
<titleabbrev>7.3</titleabbrev>
++++
This section discusses the changes that you need to be aware of when migrating
your application to Elasticsearch 7.3.
See also <<release-highlights>> and <<es-release-notes>>.
coming[7.3.0]
//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide
//tag::notable-breaking-changes[]
// end::notable-breaking-changes[]
[[breaking_73_mapping_changes]]
=== Mapping changes
[float]
==== Defining multi-fields within multi-fields
Previously, it was possible to define a multi-field within a multi-field.
Defining chained multi-fields is now deprecated and will no longer be supported
in 8.0. To resolve the issue, all instances of `fields` that occur within a
`fields` block should be removed from the mappings, either by flattening the
chained `fields` blocks into a single level, or by switching to `copy_to` if
appropriate.
[[breaking_73_plugin_changes]]
=== Plugins changes
[float]
==== IndexStorePlugin changes
IndexStore and DirectoryService have been replaced by a stateless and simple
DirectoryFactory interface to create custom Lucene directory instances per shard.