Add types and stats to search slow log

closes #2455

src/main/java/org/elasticsearch/common/Strings.java

@@ -1293,10 +1293,13 @@ public class Strings {
      * @return the delimited String
      */
     public static String collectionToDelimitedString(Iterable coll, String delim, String prefix, String suffix) {
+        return collectionToDelimitedString(coll, delim, prefix, suffix, new StringBuilder());
+    }
+
+    public static String collectionToDelimitedString(Iterable coll, String delim, String prefix, String suffix, StringBuilder sb) {
         if (Iterables.isEmpty(coll)) {
             return "";
         }
-        StringBuilder sb = new StringBuilder();
         Iterator it = coll.iterator();
         while (it.hasNext()) {
             sb.append(prefix).append(it.next()).append(suffix);
@@ -1339,10 +1342,13 @@ public class Strings {
      * @return the delimited String
      */
     public static String arrayToDelimitedString(Object[] arr, String delim) {
+        return arrayToDelimitedString(arr, delim, new StringBuilder());
+    }
+
+    public static String arrayToDelimitedString(Object[] arr, String delim, StringBuilder sb) {
         if (isEmpty(arr)) {
             return "";
         }
-        StringBuilder sb = new StringBuilder();
         for (int i = 0; i < arr.length; i++) {
             if (i > 0) {
                 sb.append(delim);

src/main/java/org/elasticsearch/index/search/slowlog/ShardSlowLogSearchService.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.index.search.slowlog;
 
 import org.elasticsearch.cluster.metadata.IndexMetaData;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.logging.ESLogger;
 import org.elasticsearch.common.logging.Loggers;
@@ -188,6 +189,20 @@ public class ShardSlowLogSearchService extends AbstractIndexShardComponent {
         public String toString() {
             StringBuilder sb = new StringBuilder();
             sb.append("took[").append(TimeValue.timeValueNanos(tookInNanos)).append("], took_millis[").append(TimeUnit.NANOSECONDS.toMillis(tookInNanos)).append("], ");
+            if (context.types() == null) {
+                sb.append("types[], ");
+            } else {
+                sb.append("types[");
+                Strings.arrayToDelimitedString(context.types(), ",", sb);
+                sb.append("], ");
+            }
+            if (context.groupStats() == null) {
+                sb.append("stats[], ");
+            } else {
+                sb.append("stats[");
+                Strings.collectionToDelimitedString(context.groupStats(), ",", "", "", sb);
+                sb.append("], ");
+            }
             sb.append("search_type[").append(context.searchType()).append("], total_shards[").append(context.numberOfShards()).append("], ");
             if (context.request().source() != null && context.request().source().length() > 0) {
                 try {