elasticsearch: remove cluster name from data path.

Elasticsearch no longer supports having the cluster name as part of path.data and fails at startup if the cluster name is in that path.

Closes #39435.

Signed-off-by: Chongyu Zhu <i@lembacon.com>

Formula/elasticsearch.rb

@@ -61,7 +61,7 @@ class Elasticsearch < Formula
 
   def post_install
     # Make sure runtime directories exist
-    (var/"lib/elasticsearch/#{cluster_name}").mkpath
+    (var/"lib/elasticsearch").mkpath
     (var/"log/elasticsearch").mkpath
     ln_s etc/"elasticsearch", libexec/"config" unless (libexec/"config").exist?
     (var/"elasticsearch/plugins").mkpath
@@ -72,7 +72,7 @@ class Elasticsearch < Formula
 
   def caveats
     s = <<~EOS
-      Data:    #{var}/lib/elasticsearch/#{cluster_name}/
+      Data:    #{var}/lib/elasticsearch/
       Logs:    #{var}/log/elasticsearch/#{cluster_name}.log
       Plugins: #{var}/elasticsearch/plugins/
       Config:  #{etc}/elasticsearch/