Changed the default file watching delays to the minimum

Currently the minimum delay defaults to 5 seconds in es

Fixes elastic/elasticsearch#196

Original commit: elastic/x-pack-elasticsearch@3a99883a90

src/main/java/org/elasticsearch/shield/authc/esusers/FileUserPasswdStore.java

@@ -39,7 +39,6 @@ import java.util.Map;
 public class FileUserPasswdStore extends AbstractComponent implements UserPasswdStore {
 
     private final Path file;
-    private final FileWatcher watcher;
     final Hasher hasher = Hasher.HTPASSWD;
 
     private volatile ImmutableMap<String, char[]> esUsers;
@@ -55,9 +54,9 @@ public class FileUserPasswdStore extends AbstractComponent implements UserPasswd
         super(settings);
         file = resolveFile(settings, env);
         esUsers = parseFile(file, logger);
-        watcher = new FileWatcher(file.getParent().toFile());
+        FileWatcher watcher = new FileWatcher(file.getParent().toFile());
         watcher.addListener(new FileListener());
-        watcherService.add(watcher);
+        watcherService.add(watcher, ResourceWatcherService.Frequency.HIGH);
         this.listener = listener;
     }
 

src/main/java/org/elasticsearch/shield/authc/esusers/FileUserRolesStore.java

@@ -55,7 +55,7 @@ public class FileUserRolesStore extends AbstractComponent implements UserRolesSt
         userRoles = parseFile(file, logger);
         FileWatcher watcher = new FileWatcher(file.getParent().toFile());
         watcher.addListener(new FileListener());
-        watcherService.add(watcher);
+        watcherService.add(watcher, ResourceWatcherService.Frequency.HIGH);
         this.listener = listener;
     }
 

src/main/java/org/elasticsearch/shield/authc/ldap/LdapGroupToRoleMapper.java

@@ -54,7 +54,7 @@ public class LdapGroupToRoleMapper extends AbstractComponent {
         groupRoles = parseFile(file, logger);
         FileWatcher watcher = new FileWatcher(file.getParent().toFile());
         watcher.addListener(new FileListener());
-        watcherService.add(watcher);
+        watcherService.add(watcher, ResourceWatcherService.Frequency.HIGH);
         this.listener = listener;
     }
 

src/main/java/org/elasticsearch/shield/transport/n2n/IPFilteringN2NAuthenticator.java

@@ -54,7 +54,7 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
         rules = parseFile(file, logger);
         FileWatcher watcher = new FileWatcher(file.getParent().toFile());
         watcher.addListener(new FileListener());
-        watcherService.add(watcher);
+        watcherService.add(watcher, ResourceWatcherService.Frequency.HIGH);
     }
 
     private Path resolveFile(Settings settings, Environment env) {