missing required parameter on the builder (#1767)

diff --git a/solr/core/src/java/org/apache/solr/cli/HealthcheckTool.java b/solr/core/src/java/org/apache/solr/cli/HealthcheckTool.java
index 44e4ea7..e0e5caf 100644
--- a/solr/core/src/java/org/apache/solr/cli/HealthcheckTool.java
+++ b/solr/core/src/java/org/apache/solr/cli/HealthcheckTool.java
@@ -63,7 +63,7 @@
             .longOpt("name")
             .argName("NAME")
             .hasArg()
-            .required(false)
+            .required(true)
             .desc("Name of the collection to check.")
             .build());
   }