[hotfix] Use jdk 1.8 for profile activation (#45)

diff --git a/pom.xml b/pom.xml
index b053360..ea5c291 100644
--- a/pom.xml
+++ b/pom.xml
@@ -392,7 +392,7 @@
 		<profile>
 			<id>opensearch1</id>
 			<activation>
-				<jdk>[8,)</jdk>
+				<jdk>[1.8,)</jdk>
 			</activation>
 			<modules>
 				<module>flink-connector-opensearch</module>