[DOCS] Fixed typos and broken attribute.

docs/reference/migration/migrate_7_0.asciidoc

@@ -12,12 +12,11 @@ Elasticsearch 7.0 node will not start in the presence of indices created in a
 version of Elasticsearch before 6.0.
 
 [IMPORTANT]
-.Reindex indices from Elasticseach 5.x or before
+.Reindex indices from Elasticsearch 5.x or before
 =========================================
 
 Indices created in Elasticsearch 5.x or before will need to be reindexed with
-Elasticsearch 6.x in order to be readable by Elasticsearch 7.x. The easiest
-way to reindex old indices is to use the `reindex` API.
+Elasticsearch 6.x in order to be readable by Elasticsearch 7.x.
 
 =========================================
 

docs/reference/search/request/sort.asciidoc

@@ -132,7 +132,7 @@ field support has a `nested` sort option with the following properties:
     current nested object.
 
 [WARNING]
-.Nested sort options before Elasticseach 6.1
+.Nested sort options before Elasticsearch 6.1
 ============================================
 
 The `nested_path` and `nested_filter` options have been deprecated in

docs/reference/upgrade/reindex_upgrade.asciidoc

@@ -75,7 +75,6 @@ To manually reindex your old indices with the <<docs-reindex,`reindex` API>>:
 .. Add any aliases that existed on the old index to the new index.
 
 
-// Flag this as X-Pack and conditionally include at GA.
 // Need to update the CSS to override sidebar titles.
 [role="xpack"]
 .Migration assistance and upgrade tools
@@ -84,7 +83,7 @@ To manually reindex your old indices with the <<docs-reindex,`reindex` API>>:
 reindexing and upgrading to 6.x. These tools are free with the X-Pack trial
 and Basic licenses and you can use them to upgrade whether or not X-Pack is a
 regular part of your Elastic Stack. For more information, see
-{stack-guide}/upgrading-elastic-stack.html.
+{stack-ref}/upgrading-elastic-stack.html.
 *******************************************
 
 [[reindex-upgrade-remote]]