Rest spec fixes (elastic/x-pack-elasticsearch#2965)

* Rename REST spec xpack.deprecation.info to xpack.migration.deprecations

* Fixed parameter-type naming in xpack.ml.get_model_snapshots

* Fixed QS multi-cluster search test to use cluster.remote_info

Original commit: elastic/x-pack-elasticsearch@ccd35b4a6c

plugin/src/test/resources/rest-api-spec/api/xpack.migration.deprecations.json

@@ -1,5 +1,5 @@
 {
-  "xpack.deprecation.info": {
+  "xpack.migration.deprecations": {
     "documentation": "http://www.elastic.co/guide/en/migration/current/migration-api-deprecation.html",
     "methods": [ "GET" ],
     "url": {

plugin/src/test/resources/rest-api-spec/api/xpack.ml.get_model_snapshots.json

@@ -21,11 +21,11 @@
       },
       "params": {
         "from": {
-          "type": "integer",
+          "type": "int",
           "description": "Skips a number of documents"
         },
         "size": {
-          "type": "integer",
+          "type": "int",
           "description": "The default number of documents returned in queries as a string."
         },
         "start": {

plugin/src/test/resources/rest-api-spec/test/deprecation/10_basic.yml

@@ -7,7 +7,7 @@ setup:
 ---
 "Test Deprecations":
   - do:
-      xpack.deprecation.info:
+      xpack.migration.deprecations:
         index: "*"
   - length: { cluster_settings: 0 }
   - length: { node_settings: 0 }

qa/multi-cluster-search-security/src/test/resources/rest-api-spec/test/multi_cluster/20_info.yml

@@ -36,7 +36,7 @@ teardown:
 
   - do:
       headers: { Authorization: "Basic am9lOnMza3JpdA==" }
-      remote.info: {}
+      cluster.remote_info: {}
   - match: { my_remote_cluster.connected: true }
   - match: { my_remote_cluster.num_nodes_connected: 1}
   - match: { my_remote_cluster.max_connections_per_cluster: 1}
@@ -69,7 +69,7 @@ teardown:
 
   - do:
       headers: { Authorization: "Basic am9lOnMza3JpdA==" }
-      remote.info: {}
+      cluster.remote_info: {}
   - set: { my_remote_cluster.http_addresses.0: remote_http }
   - match: { test_remote_cluster.http_addresses.0: $remote_http }