[TEST] add REST test for update index settings api using indices options

Relates to #10030

rest-api-spec/test/indices.put_settings/10_basic.yaml

@@ -1,5 +1,4 @@
----
-"Test indices settings":
+setup:
   - do:
       indices.create:
         index: test-index
@@ -8,6 +7,8 @@
             index:
               number_of_replicas: 0
 
+---
+"Test indices settings":
   - do:
       indices.get_settings:
         index: test-index
@@ -28,3 +29,28 @@
   - match:
       test-index.settings.index.number_of_replicas: "1"
 
+---
+"Test indices settings ignore_unavailable":
+  - do:
+      indices.put_settings:
+        ignore_unavailable: true
+        index: test-index, non-existing
+        body:
+          number_of_replicas: 1
+
+  - do:
+      indices.get_settings: {}
+
+  - match:
+      test-index.settings.index.number_of_replicas: "1"
+
+---
+"Test indices settings allow_no_indices":
+  - do:
+      indices.put_settings:
+        expand_wildcards: open
+        allow_no_indices: true
+        index: non-existing-*
+        body:
+          number_of_replicas: 1
+