enable checkstyle indentation

checkstyle.xml

@@ -164,14 +164,14 @@
             <message key="ws.notPreceded"
              value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
         </module>
-        <!-- <module name="Indentation"> -->
-        <!--     <property name="basicOffset" value="2"/> -->
-        <!--     <property name="braceAdjustment" value="0"/> -->
-        <!--     <property name="caseIndent" value="2"/> -->
-        <!--     <property name="throwsIndent" value="4"/> -->
-        <!--     <property name="lineWrappingIndentation" value="4"/> -->
-        <!--     <property name="arrayInitIndent" value="2"/> -->
-        <!-- </module> -->
+        <module name="Indentation">
+            <property name="basicOffset" value="2"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="2"/>
+            <property name="throwsIndent" value="4"/>
+            <property name="lineWrappingIndentation" value="4"/>
+            <property name="arrayInitIndent" value="2"/>
+        </module>
         <module name="AbbreviationAsWordInName">
             <property name="ignoreFinal" value="false"/>
             <property name="allowedAbbreviationLength" value="1"/>