add type to filter cache

modules/elasticsearch/src/main/java/org/elasticsearch/index/cache/filter/FilterCache.java

@@ -24,9 +24,11 @@ import org.elasticsearch.index.IndexComponent;
 import org.elasticsearch.util.component.CloseableComponent;
 
 /**
- * @author kimchy (Shay Banon)
+ * @author kimchy (shay.banon)
  */
 public interface FilterCache extends IndexComponent, CloseableComponent {
 
+    String type();
+
     Filter cache(Filter filterToCache);
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/cache/filter/none/NoneFilterCache.java

@@ -37,6 +37,10 @@ public class NoneFilterCache extends AbstractIndexComponent implements FilterCac
         logger.debug("Using no filter cache");
     }
 
+    @Override public String type() {
+        return "none";
+    }
+
     @Override public void close() {
         // nothing to do here
     }

modules/elasticsearch/src/main/java/org/elasticsearch/index/cache/filter/soft/SoftFilterCache.java

@@ -40,6 +40,10 @@ public class SoftFilterCache extends AbstractConcurrentMapFilterCache {
         super(index, indexSettings, threadPool);
     }
 
+    @Override public String type() {
+        return "soft";
+    }
+
     @Override protected ConcurrentMap<Filter, DocIdSet> buildMap() {
         return new MapMaker().softValues().makeMap();
     }

modules/elasticsearch/src/main/java/org/elasticsearch/index/cache/filter/support/AbstractConcurrentMapFilterCache.java

@@ -54,7 +54,7 @@ public abstract class AbstractConcurrentMapFilterCache extends AbstractIndexComp
 
         this.readerCleanerSchedule = componentSettings.getAsTime("readerCleanerSchedule", TimeValue.timeValueMinutes(1));
 
-        logger.debug("Using weak filter cache with readerCleanerSchedule [{}]", readerCleanerSchedule);
+        logger.debug("Using [" + type() + "] filter cache with readerCleanerSchedule [{}]", readerCleanerSchedule);
 
         this.cache = newConcurrentMap();
         this.scheduleFuture = threadPool.scheduleWithFixedDelay(new IndexReaderCleaner(), readerCleanerSchedule);

modules/elasticsearch/src/main/java/org/elasticsearch/index/cache/filter/weak/WeakFilterCache.java

@@ -40,6 +40,10 @@ public class WeakFilterCache extends AbstractConcurrentMapFilterCache {
         super(index, indexSettings, threadPool);
     }
 
+    @Override public String type() {
+        return "weak";
+    }
+
     @Override protected ConcurrentMap<Filter, DocIdSet> buildMap() {
         return new MapMaker().weakValues().makeMap();
     }