diff --git a/core/src/main/java/org/elasticsearch/index/IndexingSlowLog.java b/core/src/main/java/org/elasticsearch/index/IndexingSlowLog.java
index 5452daa7f07..75d3d60daad 100644
--- a/core/src/main/java/org/elasticsearch/index/IndexingSlowLog.java
+++ b/core/src/main/java/org/elasticsearch/index/IndexingSlowLog.java
@@ -36,6 +36,7 @@ import java.util.concurrent.TimeUnit;
 /**
  */
 public final class IndexingSlowLog implements IndexingOperationListener {
+    private final Index index;
     private boolean reformat;
     private long indexWarnThreshold;
     private long indexInfoThreshold;
@@ -85,6 +86,7 @@ public final class IndexingSlowLog implements IndexingOperationListener {
     IndexingSlowLog(IndexSettings indexSettings, ESLogger indexLogger, ESLogger deleteLogger) {
         this.indexLogger = indexLogger;
         this.deleteLogger = deleteLogger;
+        this.index = indexSettings.getIndex();
 
         indexSettings.getScopedSettings().addSettingsUpdateConsumer(INDEX_INDEXING_SLOWLOG_REFORMAT_SETTING, this::setReformat);
         this.reformat = indexSettings.getValue(INDEX_INDEXING_SLOWLOG_REFORMAT_SETTING);
@@ -141,13 +143,13 @@ public final class IndexingSlowLog implements IndexingOperationListener {
 
     private void postIndexing(ParsedDocument doc, long tookInNanos) {
         if (indexWarnThreshold >= 0 && tookInNanos > indexWarnThreshold) {
-            indexLogger.warn("{}", new SlowLogParsedDocumentPrinter(doc, tookInNanos, reformat, maxSourceCharsToLog));
+            indexLogger.warn("{}", new SlowLogParsedDocumentPrinter(index, doc, tookInNanos, reformat, maxSourceCharsToLog));
         } else if (indexInfoThreshold >= 0 && tookInNanos > indexInfoThreshold) {
-            indexLogger.info("{}", new SlowLogParsedDocumentPrinter(doc, tookInNanos, reformat, maxSourceCharsToLog));
+            indexLogger.info("{}", new SlowLogParsedDocumentPrinter(index, doc, tookInNanos, reformat, maxSourceCharsToLog));
         } else if (indexDebugThreshold >= 0 && tookInNanos > indexDebugThreshold) {
-            indexLogger.debug("{}", new SlowLogParsedDocumentPrinter(doc, tookInNanos, reformat, maxSourceCharsToLog));
+            indexLogger.debug("{}", new SlowLogParsedDocumentPrinter(index, doc, tookInNanos, reformat, maxSourceCharsToLog));
         } else if (indexTraceThreshold >= 0 && tookInNanos > indexTraceThreshold) {
-            indexLogger.trace("{}", new SlowLogParsedDocumentPrinter(doc, tookInNanos, reformat, maxSourceCharsToLog));
+            indexLogger.trace("{}", new SlowLogParsedDocumentPrinter(index, doc, tookInNanos, reformat, maxSourceCharsToLog));
         }
     }
 
@@ -156,9 +158,11 @@ public final class IndexingSlowLog implements IndexingOperationListener {
         private final long tookInNanos;
         private final boolean reformat;
         private final int maxSourceCharsToLog;
+        private final Index index;
 
-        SlowLogParsedDocumentPrinter(ParsedDocument doc, long tookInNanos, boolean reformat, int maxSourceCharsToLog) {
+        SlowLogParsedDocumentPrinter(Index index, ParsedDocument doc, long tookInNanos, boolean reformat, int maxSourceCharsToLog) {
             this.doc = doc;
+            this.index = index;
             this.tookInNanos = tookInNanos;
             this.reformat = reformat;
             this.maxSourceCharsToLog = maxSourceCharsToLog;
@@ -167,6 +171,7 @@ public final class IndexingSlowLog implements IndexingOperationListener {
         @Override
         public String toString() {
             StringBuilder sb = new StringBuilder();
+            sb.append(index).append(" ");
             sb.append("took[").append(TimeValue.timeValueNanos(tookInNanos)).append("], took_millis[").append(TimeUnit.NANOSECONDS.toMillis(tookInNanos)).append("], ");
             sb.append("type[").append(doc.type()).append("], ");
             sb.append("id[").append(doc.id()).append("], ");
diff --git a/core/src/test/java/org/elasticsearch/index/IndexingSlowLogTests.java b/core/src/test/java/org/elasticsearch/index/IndexingSlowLogTests.java
index e3676366511..9e05122322a 100644
--- a/core/src/test/java/org/elasticsearch/index/IndexingSlowLogTests.java
+++ b/core/src/test/java/org/elasticsearch/index/IndexingSlowLogTests.java
@@ -36,24 +36,30 @@ import java.io.IOException;
 
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.startsWith;
 
 public class IndexingSlowLogTests extends ESTestCase {
     public void testSlowLogParsedDocumentPrinterSourceToLog() throws IOException {
         BytesReference source = JsonXContent.contentBuilder().startObject().field("foo", "bar").endObject().bytes();
         ParsedDocument pd = new ParsedDocument(new StringField("uid", "test:id", Store.YES), new LegacyIntField("version", 1, Store.YES), "id",
                 "test", null, 0, -1, null, source, null);
-
+        Index index = new Index("foo", "123");
         // Turning off document logging doesn't log source[]
-        SlowLogParsedDocumentPrinter p = new SlowLogParsedDocumentPrinter(pd, 10, true, 0);
+        SlowLogParsedDocumentPrinter p = new SlowLogParsedDocumentPrinter(index, pd, 10, true, 0);
         assertThat(p.toString(), not(containsString("source[")));
 
         // Turning on document logging logs the whole thing
-        p = new SlowLogParsedDocumentPrinter(pd, 10, true, Integer.MAX_VALUE);
+        p = new SlowLogParsedDocumentPrinter(index, pd, 10, true, Integer.MAX_VALUE);
         assertThat(p.toString(), containsString("source[{\"foo\":\"bar\"}]"));
 
         // And you can truncate the source
-        p = new SlowLogParsedDocumentPrinter(pd, 10, true, 3);
+        p = new SlowLogParsedDocumentPrinter(index, pd, 10, true, 3);
         assertThat(p.toString(), containsString("source[{\"f]"));
+
+        // And you can truncate the source
+        p = new SlowLogParsedDocumentPrinter(index, pd, 10, true, 3);
+        assertThat(p.toString(), containsString("source[{\"f]"));
+        assertThat(p.toString(), startsWith("[foo/123] took"));
     }
 
     public void testReformatSetting() {