Change type from 'log' to 'filestream' to ensure compatibility with Elastic 8

salt/filebeat/pillar.example

@@ -1,7 +1,7 @@
 filebeat:
   config:
     inputs:
-      - type: log
+      - type: filestream
         paths:
           - /nsm/mylogdir/mylog.log
         fields:
@@ -19,4 +19,4 @@ filebeat:
     output:
       file:
         path: "/tmp/filebeat"
-        filename: filebeat
+        filename: filebeat