Generate release notes for 7.0.0-alpha1. (#39899)

We were missing release notes for 7.0.0-alpha1. I generated them by running the release-notes script with a quick hack that filtered out pull requests that had been closed on or after 2018-11-15. Some breaking changes had been documented in the release notes rather than the migration guide so I moved them.
elastic · Mar 12, 2019 · 5528554 · 5528554
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diff --git a/docs/reference/migration/migrate_7_0.asciidoc b/docs/reference/migration/migrate_7_0.asciidoc
@@ -16,6 +16,7 @@ See also <<release-highlights>> and <<es-release-notes>>.
 * <<breaking_70_indices_changes>>
 * <<breaking_70_mappings_changes>>
 * <<breaking_70_search_changes>>
+* <<breaking_70_suggesters_changes>>
 * <<breaking_70_packaging_changes>>
 * <<breaking_70_plugins_changes>>
 * <<breaking_70_analysis_changes>>
@@ -61,6 +62,7 @@ include::migrate_7_0/discovery.asciidoc[]
 include::migrate_7_0/indices.asciidoc[]
 include::migrate_7_0/mappings.asciidoc[]
 include::migrate_7_0/search.asciidoc[]
+include::migrate_7_0/suggesters.asciidoc[]
 include::migrate_7_0/packaging.asciidoc[]
 include::migrate_7_0/plugins.asciidoc[]
 include::migrate_7_0/api.asciidoc[]

diff --git a/docs/reference/migration/migrate_7_0/aggregations.asciidoc b/docs/reference/migration/migrate_7_0/aggregations.asciidoc
@@ -32,3 +32,10 @@ being provided via the `params` object as `params._agg`.
 
 The metric aggregation has been changed to require these two script parameters to ensure users are
 explicitly defining how their data is processed.
+
+[float]
+==== `percentiles` and `percentile_ranks` now return `null` instead of `NaN`
+
+The `percentiles` and `percentile_ranks` aggregations used to return `NaN` in
+the response if they were applied to an empty set of values. Because `NaN` is
+not officially supported by JSON, it has been replaced with `null`.
diff --git a/docs/reference/migration/migrate_7_0/api.asciidoc b/docs/reference/migration/migrate_7_0/api.asciidoc
@@ -154,3 +154,9 @@ However, the monitoring APIs were the only exception to this rule. This exceptio
 has been forfeited and index monitoring privileges have to be granted explicitly,
 using the `allow_restricted_indices` flag on the permission (as any other index
 privilege).
+
+[float]
+==== Removed support for `GET` on the `_cache/clear` API
+
+The `_cache/clear` API no longer supports the `GET` HTTP verb. It must be called
+with `POST`.
diff --git a/docs/reference/migration/migrate_7_0/suggesters.asciidoc b/docs/reference/migration/migrate_7_0/suggesters.asciidoc
@@ -0,0 +1,9 @@
+[float]
+[[breaking_70_suggesters_changes]]
+=== Suggesters changes
+
+[float]
+==== Registration of suggesters in plugins has changed
+
+Plugins must now explicitly indicate the type of suggestion that they produce.
+