diff --git a/elasticsearch-init/Dockerfile b/elasticsearch-init/Dockerfile
index 71a559e..44a6cc5 100644
--- a/elasticsearch-init/Dockerfile
+++ b/elasticsearch-init/Dockerfile
@@ -21,6 +21,12 @@ COPY --from=yq /yq /usr/bin/yq
 COPY --from=elasticsearch /usr/share/opensearch/config /elasticsearch/default-config
 COPY --from=elasticsearch /usr/share/opensearch/plugins/opensearch-security/securityconfig /elasticsearch/default-securityconfig
 
-RUN chmod -c 755 /usr/local/bin/config-merger.sh
+RUN chmod -c 777 /usr/local/bin/config-merger.sh
+
+RUN chgrp -R 0 /elasticsearch/default-config \
+  && chmod -R g=u /elasticsearch/default-config
+
+RUN chgrp -R 0 /elasticsearch/default-securityconfig \
+  && chmod -R g=u /elasticsearch/default-securityconfig
 
 ENTRYPOINT ["/bin/bash","/usr/local/bin/config-merger.sh"]