diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/action/StartDatafeedAction.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/action/StartDatafeedAction.java
index 15bb7d9d30a..4ba07422256 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/action/StartDatafeedAction.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/action/StartDatafeedAction.java
@@ -55,7 +55,6 @@ public class StartDatafeedAction
 
     public static final ParseField START_TIME = new ParseField("start");
     public static final ParseField END_TIME = new ParseField("end");
-    public static final ParseField START_TIMEOUT = new ParseField("start_timeout");
 
     public static final StartDatafeedAction INSTANCE = new StartDatafeedAction();
     public static final String NAME = "cluster:admin/ml/datafeeds/start";
diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/datafeed/DatafeedJobRunner.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/datafeed/DatafeedJobRunner.java
index fd0461d5ad2..06e903a39b6 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/datafeed/DatafeedJobRunner.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/ml/datafeed/DatafeedJobRunner.java
@@ -12,6 +12,7 @@ import org.elasticsearch.common.component.AbstractComponent;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.common.util.concurrent.FutureUtils;
+import org.elasticsearch.index.mapper.DateFieldMapper;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.xpack.ml.MlPlugin;
 import org.elasticsearch.xpack.ml.action.StartDatafeedAction;
@@ -40,6 +41,8 @@ import java.util.function.Supplier;
 
 public class DatafeedJobRunner extends AbstractComponent {
 
+    private static final String INF_SYMBOL = "\u221E";
+
     private final Client client;
     private final ClusterService clusterService;
     private final JobProvider jobProvider;
@@ -80,7 +83,9 @@ public class DatafeedJobRunner extends AbstractComponent {
     // otherwise if a stop datafeed call is made immediately after the start datafeed call we could cancel
     // the DatafeedTask without stopping datafeed, which causes the datafeed to keep on running.
     private void innerRun(Holder holder, long startTime, Long endTime) {
-        logger.info("Starting datafeed [{}] for job [{}]", holder.datafeed.getId(), holder.datafeed.getJobId());
+        logger.info("Starting datafeed [{}] for job [{}] in [{}, {})", holder.datafeed.getId(), holder.datafeed.getJobId(),
+                DateFieldMapper.DEFAULT_DATE_TIME_FORMATTER.printer().print(startTime),
+                endTime == null ? INF_SYMBOL : DateFieldMapper.DEFAULT_DATE_TIME_FORMATTER.printer().print(endTime));
         holder.future = threadPool.executor(MlPlugin.DATAFEED_RUNNER_THREAD_POOL_NAME).submit(() -> {
             Long next = null;
             try {