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>>.
//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide
//tag::notable-breaking-changes[]
[discrete]
[[breaking_73_api_changes]]
=== API changes
[discrete]
==== {dataframe-transform-cap} API changes
It is no longer possible to supply the `format` parameter when you define a
`date_histogram` {dataframe-transform} pivot. Previously constructed transforms
will still run but the configured `format` will be ignored.
[discrete]
[[breaking_73_mapping_changes]]
=== Mapping changes
`dense_vector` field now requires `dims` parameter, specifying the number of
dimensions for document and query vectors for this field.
[discrete]
==== 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.
[discrete]
[[breaking_73_plugin_changes]]
=== Plugins changes
[discrete]
==== IndexStorePlugin changes
IndexStore and DirectoryService have been replaced by a stateless and simple
DirectoryFactory interface to create custom Lucene directory instances per shard.
[discrete]
[[breaking_73_search_changes]]
=== Search changes
[discrete]
==== Deprecation of queries
The `common` query has been deprecated. The same functionality can be achieved
by the `match` query if the total number of hits is not tracked.
[discrete]
===== Deprecation of query parameters
The `cutoff_frequency` parameter has been deprecated for `match` and `multi_match`
queries. The same functionality can be achieved without any configuration provided
that the total number of hits is not tracked.
[discrete]
[[breaking_73_ccr_changes]]
=== CCR changes
[discrete]
==== Directly modifying aliases of follower indices is no longer allowed
Aliases are now replicated to a follower from its leader, so directly modifying
aliases on follower indices is no longer allowed.
// end::notable-breaking-changes[]