Fixes for rolling upgrade

qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/RecoveryIT.java

@@ -300,7 +300,11 @@ public void testRecoveryWithSoftDeletes() throws Exception {
                 if (randomBoolean()) {
                     indexDocs(index, i, 1); // update
                 } else if (randomBoolean()) {
-                    client().performRequest(new Request("DELETE", index + "/test/" + i));
+                    if (getNodeId(v -> v.onOrAfter(Version.V_7_0_0)) == null) {
+                        client().performRequest(new Request("DELETE", index + "/test/" + i));
+                    } else {
+                        client().performRequest(new Request("DELETE", index + "/_doc/" + i));
+                    }
                 }
             }
         }

qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/10_basic.yml

@@ -67,8 +67,3 @@
   - match: { hits.total: 1 }
   - match: { hits.hits.0._id: q3 }
 
----
-"Index with _all is available":
-  - do:
-      indices.get:
-        index: all-index

qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/10_basic.yml

@@ -200,19 +200,3 @@
         wait_for_completion: true
         task_id: $task
 
----
-"Create an index with _all explicitly disabled":
-  - skip:
-      features: warnings
-  - do:
-      warnings:
-        - "[_all] is deprecated in 6.0+ and will be removed in 7.0. As a replacement, you can use [copy_to] on mapping fields to create your own catch all field."
-      indices.create:
-        index: all-index
-        body:
-          mappings:
-            _all:
-              enabled: false
-            properties:
-              field:
-                type: text

qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/10_basic.yml

@@ -125,17 +125,4 @@
         task_id: $task_id
   - match: { task.headers.X-Opaque-Id: "Reindexing Again" }
 
----
-"Index with _all is available":
-  - do:
-      indices.get:
-        index: all-index
-
-  - do:
-      indices.get_mapping:
-        include_type_name: false
-        index: all-index
-
-  - is_true: all-index.mappings._all
-  - match: { all-index.mappings._all.enabled: false}