Fix another missing dependency

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/release-2.22-branch@1900763 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/connectors/opensearchserver/pom.xml b/connectors/opensearchserver/pom.xml
index 1024e7a..657730d 100644
--- a/connectors/opensearchserver/pom.xml
+++ b/connectors/opensearchserver/pom.xml
@@ -228,6 +228,11 @@
       <artifactId>commons-codec</artifactId>
       <version>${commons-codec.version}</version>
     </dependency>
+    <dependency>
+      <groupId>commons-collections</groupId>
+      <artifactId>commons-collections</artifactId>
+      <version>${commons-collections.version}</version>
+    </dependency>
     
     <!-- Testing dependencies -->