[DOCS] Remove unneeded breaking changes files (#80729)

Removes some unneeded files related to the previous organization of breaking changes.

Relates to #79162 and https://github.com/elastic/stack-docs/pull/1877

docs/reference/migration/index.asciidoc

@@ -1,9 +1,6 @@
 [[breaking-changes]]
 = Migration guide
 
-:ess-setting-change: {ess-icon} indicates a change to a supported {cloud}/ec-add-user-settings.html[user setting] for {ess}.
-:ess-skip-section: If you use {ess}, skip this section. {ess} handles these changes for you.
-
 This section discusses the changes that you need to be aware of to migrate
 your application to {version}. For more information about what's new in this
 release, see the <<release-highlights>> and <<es-release-notes>>.

docs/reference/migration/migrate_8_0.asciidoc

@@ -27,17 +27,17 @@ the old behavior is supported until the next major release.
 To find out if you are using any deprecated functionality,
 enable <<deprecation-logging, deprecation logging>>.
 
-include::migrate_8_0/_cluster-node-setting-changes.asciidoc[]
-include::migrate_8_0/_command-line-tool-changes.asciidoc[]
-include::migrate_8_0/_index-setting-changes.asciidoc[]
-include::migrate_8_0/_java-api-changes.asciidoc[]
-include::migrate_8_0/_jvm-option-changes.asciidoc[]
-include::migrate_8_0/_logging-changes.asciidoc[]
-include::migrate_8_0/_mapping-changes.asciidoc[]
-include::migrate_8_0/_packaging-changes.asciidoc[]
-include::migrate_8_0/_painless-changes.asciidoc[]
-include::migrate_8_0/_rest-api-changes.asciidoc[]
-include::migrate_8_0/_system-req-changes.asciidoc[]
+include::migrate_8_0/cluster-node-setting-changes.asciidoc[]
+include::migrate_8_0/command-line-tool-changes.asciidoc[]
+include::migrate_8_0/index-setting-changes.asciidoc[]
+include::migrate_8_0/java-api-changes.asciidoc[]
+include::migrate_8_0/jvm-option-changes.asciidoc[]
+include::migrate_8_0/logging-changes.asciidoc[]
+include::migrate_8_0/mapping-changes.asciidoc[]
+include::migrate_8_0/packaging-changes.asciidoc[]
+include::migrate_8_0/painless-changes.asciidoc[]
+include::migrate_8_0/rest-api-changes.asciidoc[]
+include::migrate_8_0/system-req-changes.asciidoc[]
 include::migrate_8_0/transform.asciidoc[]
 
 [discrete]

docs/reference/migration/migrate_8_0/aggregations.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_aggregations_changes]]
-==== Aggregations changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/allocation.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_allocation_changes]]
-==== Allocation changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/analysis.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_analysis_changes]]
-==== Analysis changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/api.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_api_changes]]
-==== REST API changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/breaker.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_breaker_changes]]
-==== Circuit breaker changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/ccr.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_ccr_changes]]
-==== {ccr-cap} ({ccr-init}) changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/cluster.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_cluster_changes]]
-==== Cluster changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/discovery.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_discovery_changes]]
-==== Discovery changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/eql.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_eql_changes]]
-==== EQL changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/http.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_http_changes]]
-==== HTTP changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/ilm.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_ilm_changes]]
-==== {ilm-cap} ({ilm-init}) changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/indices.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_indices_changes]]
-==== Indices changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/ingest.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_ingest_changes]]
-==== Ingest pipeline changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/java.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_java_changes]]
-==== Java API changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/logging.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_logging_changes]]
-==== Logging changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/mappings.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_mappings_changes]]
-==== Mapping changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/network.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_network_changes]]
-==== Network changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/node.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_node_changes]]
-==== Node changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/packaging.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_packaging_changes]]
-==== Packaging changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/reindex.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_reindex_changes]]
-==== Reindex changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/rollup.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_rollup_changes]]
-==== Rollup changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/scripting.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_scripting_changes]]
-==== Scripting changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/search.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_search_changes]]
-==== Search changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/security.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_security_changes]]
-==== Security changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/settings.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_settings_changes]]
-==== Settings changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/snapshots.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_snapshots_changes]]
-==== Snapshot and restore changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/threadpool.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_threadpool_changes]]
-==== Thread pool changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/transport.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_transport_changes]]
-==== Transport changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]

docs/reference/migration/migrate_8_0/watcher.asciidoc

@@ -1,8 +0,0 @@
-[discrete]
-[[breaking_80_watcher_changes]]
-==== Watcher changes
-
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-//tag::notable-breaking-changes[]
-//end::notable-breaking-changes[]