[ML][Data Frame] Fixing default delay set in timesync (#44281) (#44293)

* [ML][Data Frame] Fixing default delay set in timesync

* disallowing explicit null, don't do duration check on write

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/dataframe/transforms/TimeSyncConfig.java

@@ -27,6 +27,7 @@ import static org.elasticsearch.common.xcontent.ConstructingObjectParser.optiona
 
 public class TimeSyncConfig  implements SyncConfig {
 
+    public static final TimeValue DEFAULT_DELAY = TimeValue.timeValueSeconds(60);
     private static final String NAME = "data_frame_transform_pivot_sync_time";
 
     private final String field;
@@ -37,20 +38,18 @@ public class TimeSyncConfig  implements SyncConfig {
 
     private static ConstructingObjectParser<TimeSyncConfig, Void> createParser(boolean lenient) {
         ConstructingObjectParser<TimeSyncConfig, Void> parser = new ConstructingObjectParser<>(NAME, lenient,
-                args -> {
-                    String field = (String) args[0];
-                    TimeValue delay = args[1] != null ? (TimeValue) args[1] : TimeValue.ZERO;
-
-                    return new TimeSyncConfig(field, delay);
-                    });
-
+            args -> {
+                String field = (String) args[0];
+                TimeValue delay = (TimeValue) args[1];
+                return new TimeSyncConfig(field, delay);
+            });
         parser.declareString(constructorArg(), DataFrameField.FIELD);
         parser.declareField(optionalConstructorArg(),
-                (p, c) -> TimeValue.parseTimeValue(p.textOrNull(), DataFrameField.DELAY.getPreferredName()), DataFrameField.DELAY,
-                ObjectParser.ValueType.STRING_OR_NULL);
-
-                    return parser;
-                }
+            (p, c) -> TimeValue.parseTimeValue(p.text(), DEFAULT_DELAY, DataFrameField.DELAY.getPreferredName()),
+            DataFrameField.DELAY,
+            ObjectParser.ValueType.STRING);
+        return parser;
+    }
 
     public TimeSyncConfig() {
         this(null, null);
@@ -58,7 +57,7 @@ public class TimeSyncConfig  implements SyncConfig {
 
     public TimeSyncConfig(final String field, final TimeValue delay) {
         this.field = ExceptionsHelper.requireNonNull(field, DataFrameField.FIELD.getPreferredName());
-        this.delay = ExceptionsHelper.requireNonNull(delay, DataFrameField.DELAY.getPreferredName());
+        this.delay = delay == null ? DEFAULT_DELAY : delay;
     }
 
     public TimeSyncConfig(StreamInput in) throws IOException {
@@ -89,9 +88,7 @@ public class TimeSyncConfig  implements SyncConfig {
     public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
         builder.startObject();
         builder.field(DataFrameField.FIELD.getPreferredName(), field);
-        if (delay.duration() > 0) {
-            builder.field(DataFrameField.DELAY.getPreferredName(), delay.getStringRep());
-        }
+        builder.field(DataFrameField.DELAY.getPreferredName(), delay.getStringRep());
         builder.endObject();
         return builder;
     }

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/dataframe/transforms/TimeSyncConfigTests.java

@@ -14,6 +14,8 @@ import org.elasticsearch.xpack.core.dataframe.transforms.TimeSyncConfig;
 
 import java.io.IOException;
 
+import static org.hamcrest.Matchers.equalTo;
+
 public class TimeSyncConfigTests extends AbstractSerializingTestCase<TimeSyncConfig> {
 
     public static TimeSyncConfig randomTimeSyncConfig() {
@@ -35,4 +37,8 @@ public class TimeSyncConfigTests extends AbstractSerializingTestCase<TimeSyncCon
         return TimeSyncConfig::new;
     }
 
+    public void testDefaultDelay() {
+        TimeSyncConfig config = new TimeSyncConfig(randomAlphaOfLength(10), null);
+        assertThat(config.getDelay(), equalTo(TimeSyncConfig.DEFAULT_DELAY));
+    }
 }

x-pack/plugin/data-frame/src/main/java/org/elasticsearch/xpack/dataframe/action/TransportPutDataFrameTransformAction.java

@@ -205,8 +205,7 @@ public class TransportPutDataFrameTransformAction
 
         final Pivot pivot = new Pivot(config.getPivotConfig());
 
-
-        // <5> Return the listener, or clean up destination index on failure.
+        // <3> Return to the listener
         ActionListener<Boolean> putTransformConfigurationListener = ActionListener.wrap(
             putTransformConfigurationResult -> {
                 auditor.info(config.getId(), "Created data frame transform.");
@@ -215,7 +214,7 @@ public class TransportPutDataFrameTransformAction
             listener::onFailure
         );
 
-        // <4> Put our transform
+        // <2> Put our transform
         ActionListener<Boolean> pivotValidationListener = ActionListener.wrap(
             validationResult -> dataFrameTransformsConfigManager.putTransformConfiguration(config, putTransformConfigurationListener),
             validationException -> listener.onFailure(

x-pack/plugin/src/test/resources/rest-api-spec/test/data_frame/transforms_crud.yml

@@ -259,6 +259,39 @@ setup:
   - match: { transforms.0.sync.time.field: "time" }
   - match: { transforms.0.sync.time.delay: "90m" }
 ---
+"Test PUT continuous transform without delay set":
+  - do:
+      data_frame.put_data_frame_transform:
+        transform_id: "airline-transform-continuous"
+        body: >
+          {
+            "source": {
+              "index": "airline-data"
+            },
+            "dest": { "index": "airline-data-by-airline-continuous" },
+            "pivot": {
+              "group_by": { "airline": {"terms": {"field": "airline"}}},
+              "aggs": {"avg_response": {"avg": {"field": "responsetime"}}}
+            },
+            "sync": {
+              "time": {
+                "field": "time"
+              }
+            }
+          }
+  - match: { acknowledged: true }
+  - do:
+      data_frame.get_data_frame_transform:
+        transform_id: "airline-transform-continuous"
+  - match: { count: 1 }
+  - match: { transforms.0.id: "airline-transform-continuous" }
+  - match: { transforms.0.source.index.0: "airline-data" }
+  - match: { transforms.0.dest.index: "airline-data-by-airline-continuous" }
+  - match: { transforms.0.pivot.group_by.airline.terms.field: "airline" }
+  - match: { transforms.0.pivot.aggregations.avg_response.avg.field: "responsetime" }
+  - match: { transforms.0.sync.time.field: "time" }
+  - match: { transforms.0.sync.time.delay: "60s" }
+---
 "Test transform with invalid page parameter":
   - do:
       catch: /Param \[size\] has a max acceptable value of \[1000\]/