Adding test for Indecx sort half_float

Signed-off-by: Chaitanya Gohel <[email protected]>

rest-api-spec/src/main/resources/rest-api-spec/test/indices.sort/10_basic.yml

@@ -156,3 +156,23 @@
           query: {"range": { "rank": { "from": 0 } } }
           track_total_hits: false
           size: 3
+
+---
+"Index Sort half float":
+  - do:
+      catch: bad_request
+      indices.create:
+        index: test
+        body:
+          settings:
+            number_of_shards: 1
+            number_of_replicas: 0
+            index.sort.field: rank
+          mappings:
+            properties:
+              rank:
+                type: half_float
+
+  # This should failed with 400 as half_float is not supported for index sort
+  - match: { status: 400 }
+  - match: { error.type: illegal_argument_exception }