Fix references to .ci

Author: pquentin

CONTRIBUTING.md

@@ -13,7 +13,7 @@ before writing too much code.
 ## Running Elasticsearch locally
 
 We've provided a script to start an Elasticsearch cluster of a certain version
-found at `.ci/run-elasticsearch.sh`.
+found at `.buildkite/run-elasticsearch.sh`.
 
 There are several environment variables that control integration tests:
 

elasticsearch/helpers/test.py

@@ -30,7 +30,7 @@
 else:
     ELASTICSEARCH_URL = "https://elastic:changeme@localhost:9200"
 
-CA_CERTS = join(dirname(dirname(dirname(abspath(__file__)))), ".ci/certs/ca.pem")
+CA_CERTS = join(dirname(dirname(dirname(abspath(__file__)))), ".buildkite/certs/ca.pem")
 
 
 def get_test_client(nowait=False, **kwargs):