[TEST] Remove 'gtelte' feature from yaml tests

Some yaml tests still used the 'gtelte' feature in their skip section.
Since all language clients support this, the feature skip can be
removed.

rest-api-spec/test/create/75_ttl.yaml

@@ -1,9 +1,6 @@
 ---
 "TTL":
 
- - skip:
-      features: gtelte
-
  - do:
       indices.create:
           index:    test_1

rest-api-spec/test/index/75_ttl.yaml

@@ -1,8 +1,6 @@
 ---
 "TTL":
 
- - skip:
-      features: gtelte
  - do:
       indices.create:
           index:    test_1

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

@@ -1,9 +1,6 @@
 ---
 "Indices recovery test":
 
-  - skip:
-      features: gtelte
-
   - do:
       indices.create:
         index:  test_1

rest-api-spec/test/update/75_ttl.yaml

@@ -1,9 +1,6 @@
 ---
 "TTL":
 
- - skip:
-      features: gtelte
-
  - do:
       indices.create:
           index:    test_1

src/test/java/org/elasticsearch/test/rest/support/Features.java

@@ -34,7 +34,7 @@ import java.util.List;
  */
 public final class Features {
 
-    private static final List<String> SUPPORTED = Lists.newArrayList("gtelte", "stash_in_path", "groovy_scripting");
+    private static final List<String> SUPPORTED = Lists.newArrayList("stash_in_path", "groovy_scripting");
 
     private Features() {