testing output, both with default field names and shorthand aliases

rest-api-spec/src/main/resources/rest-api-spec/test/cat.indices/10_basic.yaml

@@ -36,3 +36,18 @@
                   (\d+|\d+[.]\d+)(kb|b) \s*
                 )
                 $/
+                
+  - do:
+      cat.indices:
+        v: false
+        h: i,cd,cds,creation.date,creation.date.string
+  - match:
+      $body: |
+               /^(
+                  index1                                                    \s+
+                  (\d+)                                                     \s+
+                  (\d\d\d\d\-\d\d\-\d\d T\d\d:\d\d:\d\d.\d\d\d\+\d\d:\d\d)  \s+
+                  (\d+)                                                     \s+
+                  (\d\d\d\d\-\d\d\-\d\d T\d\d:\d\d:\d\d.\d\d\d\+\d\d:\d\d)  \s*
+                )
+                $/