Remove the Elasticsearch changelog

It was deleted from the Elasticsearch repo, see elastic/elasticsearch@0f85c64

Author: javanna

conf.yaml

@@ -115,10 +115,7 @@ contents:
                 repo:   elasticsearch
                 path:   docs/Versions.asciidoc
                 exclude_branches:   [ 2.4, 2.3, 2.2, 2.1, 2.0, 1.7, 1.6, 1.5, 1.4, 1.3, 0.90 ]
-              -
-                repo:   elasticsearch
-                path:   docs/CHANGELOG.asciidoc
-                exclude_branches:   [ 5.6, 5.5, 5.4, 5.3, 5.2, 5.1, 5.0, 2.4, 2.3, 2.2, 2.1, 2.0, 1.7, 1.6, 1.5, 1.4, 1.3, 0.90 ]
+
               -
                 repo:   x-pack-elasticsearch
                 prefix: elasticsearch-extra/x-pack-elasticsearch