Add migration note on the number of shards

jasontedor · jasontedor · commit e8fe624570b1 · 2018-12-06T19:15:45.000-05:00
This commit adds a migration note regarding the default number of shards changing from five to one. Relates #30539
diff --git a/docs/reference/migration/migrate_7_0/indices.asciidoc b/docs/reference/migration/migrate_7_0/indices.asciidoc
@@ -2,6 +2,11 @@
 [[breaking_70_indices_changes]]
 === Indices changes
 
+[float]
+==== Index creation no longer defaults to five shards
+Previous versions of Elasticsearch defaulted to creating five shards per index.
+Starting with 7.0.0, the default is now one index per shard.
+
 [float]
 ==== `:` is no longer allowed in index name
 
