Fix lint error

Signed-off-by: Aleksandr Tuliakov <[email protected]>

Author: MrChaos1993

tests/default/rollup/jobs.yaml

@@ -117,7 +117,7 @@ chapters:
             index:
               number_of_shards: '2'
               number_of_replicas: '0'
-              codec: 'zlib'
+              codec: zlib
   - synopsis: Get an index rollup job with target_index_settings.
     version: '>= 3.0'
     path: /_plugins/_rollup/jobs/{id}
@@ -134,7 +134,7 @@ chapters:
             index:
               number_of_shards: '2'
               number_of_replicas: '0'
-              codec: 'zlib'
+              codec: zlib
   - synopsis: Delete an index rollup job.
     path: /_plugins/_rollup/jobs/{id}
     method: DELETE