[[breaking-changes-7.9]]
== Breaking changes in 7.9
++++
<titleabbrev>7.9</titleabbrev>
++++

This section discusses the changes that you need to be aware of when migrating
your application to {es} 7.9.

See also <<release-highlights>> and <<es-release-notes>>.

* <<breaking_79_indices_changes>>
* <<breaking_79_script_cache_changes>>
* <<breaking_79_settings_changes>>

//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide

//tag::notable-breaking-changes[]
[discrete]
[[breaking_79_indices_changes]]
=== Indices changes
.{es} includes built-in index templates for `logs-*-*` and `metrics-*-*`.

[%collapsible]
====
*Details* +
In 7.9, {es} added built-in index templates for the `metrics-*-*` and
`logs-*-*` index patterns, each with a priority of `100`.
{ingest-guide}/ingest-management-overview.html[{agent}] uses these templates to
create data streams.

*Impact* +
If you use {agent}, assign your index templates a priority
lower than `100` to avoid overriding the built-in templates.

Otherwise, to avoid accidentally applying the built-in templates, use a
non-overlapping index pattern or assign templates with an overlapping pattern a
`priority` higher than `100`.

For example, if you don't use {agent} and want to use a template for the
`logs-*` index pattern, assign your template a priority of `200`. This ensures
your template is applied instead of the built-in template for `logs-*-*`.
====
//end::notable-breaking-changes[]

//tag::notable-breaking-changes[]
[discrete]
[[breaking_79_script_cache_changes]]
=== Script cache changes
[[deprecate_general_script_cache_size]]
.The `script.cache.max_size` setting is deprecated.

[%collapsible]
====
*Details* +
The `script.cache.max_size` setting is deprecated. In {es} 8.0.0, this is
set per-context.

*Impact* +
To avoid deprecation warnings, discontinue use of the `script.cache.max_size`
setting. You may use `script.context.$CONTEXT.cache_max_size` for the particular context.
For example, for the `ingest` context, use `script.context.ingest.cache_max_size`.

====

[discrete]
[[deprecate_general_script_expire]]
.The `script.cache.expire` setting is deprecated.

[%collapsible]
====
*Details* +
The `script.cache.expire` setting is deprecated. In {es} 8.0.0, this is
set per-context.

*Impact* +
To avoid deprecation warnings, discontinue use of the `script.cache.expire`
setting. You may use `script.context.$CONTEXT.cache_expire` for the particular context.
For example, for the `update` context, use `script.context.update.cache_expire`.

====

[discrete]
[[deprecate_general_script_compile_rate]]
.The `script.max_compilations_rate` setting is deprecated.

[%collapsible]
====
*Details* +
The `script.max_compilations_rate` setting is deprecated. In {es} 8.0.0, this is
set per-context.

*Impact* +
To avoid deprecation warnings, discontinue use of the `script.max_compilations_rate`
setting. You may use `script.context.$CONTEXT.max_compilations_rate` for the particular
context.  For example, for the `processor_conditional` context, use
`script.context.processor_conditional.max_compilations_rate`.

====

[discrete]
[[deprecate_mapping_updates_for_ingest_privileges]]
.Mapping actions have been deprecated for the `create_doc`, `create`, `index` and `write` privileges.
[%collapsible]
====
*Details* +
In {es} 8.0.0, the following privileges will no longer allow users to
explicitly update the mapping of an index:

* `create_doc`
* `create`
* `index`
* `write`

Additionally, in {es} 8.0.0, the following privileges will no longer allow users to
{ref}/dynamic-mapping.html[dynamically update the mapping] of an index 
during indexing or ingest:

* `create_doc`
* `create`
* `index`

These privileges will continue to allow mapping actions on indices (but not on data streams) until
{es} 8.0.0. However, deprecation warnings will be returned.

*Impact* +
To allow users to explicitly update the mapping of an index,
grant the `manage` privilege.

To dynamically update the mapping of an index during indexing or
ingest, grant the `auto_configure` privilege and use index templates. This lets
you dynamically update the index mapping based on the template's mapping configuration.
====

[discrete]
[[breaking_79_settings_changes]]
=== Settings changes

[[deprecate_auto_import_dangling_indices]]
.Automatically importing dangling indices is disabled by default.

[%collapsible]
====
*Details* +
Automatically importing <<dangling-indices,dangling indices>> into the cluster
is unsafe and is now disabled by default. This feature will be removed entirely
in {es} 8.0.0.

*Impact* +
Use the <<dangling-indices-api,Dangling indices API>> to list, delete or import
any dangling indices manually.

Alternatively you can enable automatic imports of dangling indices, recovering
the unsafe behaviour of earlier versions, by setting
`gateway.auto_import_dangling_indices` to `true`. This setting is deprecated
and will be removed in {es} 8.0.0. We do not recommend using this setting.

====
//end::notable-breaking-changes[]