Fix: removed ES6 from integration

Author: rupozzi

.github/workflows/integration.yml

@@ -35,8 +35,6 @@ jobs:
             ARGS: MYSQL_VER=mysql:5.7
           - TEST_NAME: "MariaDB 10.6, opensearch:1.0.0"
             ARGS: MYSQL_VER=mariadb:10.6.3 ES_VER=opensearchproject/opensearch:1.0.0
-          - TEST_NAME: "Elasticsearch 6.6.0"
-            ARGS: ES_VER=elasticsearch:6.6.0
           - TEST_NAME: "HTTPS"
             ARGS: TEST_HTTPS=Yes