Add entropy mapping

salt/elasticsearch/templates/component/so/so-scan-mappings.json

@@ -33,10 +33,17 @@
                   }
                 }
               }
-            }
+            },
+	    "entropy": {
+              "properties": {
+                "entropy": {
+	          "type": "float"
+		}
+	      }
+	    }
           }
         }
       }
     }
   }
-}
+}