ESQL: Add times to topn status

Adds times to the TopNOperator status, specifically the nanoseconds
spent receiving the values and the nanoseconds spent emitting the values:
```
          {
            "operator" : "TopNOperator[count=0/1000, elementTypes=[BYTES_REF, DOUBLE], encoders=[UTF8TopNEncoder, DefaultSortable], sortOrders=[SortOrder[channel=1, asc=false, nullsFirst=true]]]",
            "status" : {
              "receive_nanos" : 193415,   <--- this row
              "emit_nanos" : 61,          <--- and this row
              "occupied_rows" : 0,
              "ram_bytes_used" : 4296,
              "ram_used" : "4.1kb",
              "pages_received" : 1,
              "pages_emitted" : 1,
              "rows_received" : 1000,
              "rows_emitted" : 1000
            }
          }
```

Author: nik9000

server/src/main/java/org/elasticsearch/TransportVersions.java

@@ -342,6 +342,7 @@ static TransportVersion def(int id) {
     public static final TransportVersion NODE_USAGE_STATS_FOR_THREAD_POOLS_IN_CLUSTER_INFO = def(9_121_0_00);
     public static final TransportVersion ESQL_CATEGORIZE_OPTIONS = def(9_122_0_00);
     public static final TransportVersion ML_INFERENCE_AZURE_AI_STUDIO_RERANK_ADDED = def(9_123_0_00);
+    public static final TransportVersion ESQL_TOPN_TIMINGS = def(9_124_0_00);
 
     /*
      * STOP! READ THIS FIRST! No, really,

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/operator/topn/TopNOperator.java

@@ -308,6 +308,9 @@ public String describe() {
 
     private Iterator<Page> output;
 
+    private long receiveNanos;
+    private long emitNanos;
+
     /**
      * Count of pages that have been received by this operator.
      */
@@ -387,6 +390,7 @@ public boolean needsInput() {
 
     @Override
     public void addInput(Page page) {
+        long start = System.nanoTime();
         /*
          * Since row tracks memory we have to be careful to close any unused rows,
          * including any rows that fail while constructing because they allocate
@@ -423,6 +427,7 @@ public void addInput(Page page) {
             pagesReceived++;
             rowsReceived += page.getPositionCount();
         }
+        receiveNanos += System.nanoTime() - start;
     }
 
     @Override
@@ -548,9 +553,11 @@ public Page getOutput() {
         if (output == null || output.hasNext() == false) {
             return null;
         }
+        long start = System.nanoTime();
         Page ret = output.next();
         pagesEmitted++;
         rowsEmitted += ret.getPositionCount();
+        emitNanos += System.nanoTime() - start;
         return ret;
     }
 
@@ -588,7 +595,16 @@ public long ramBytesUsed() {
 
     @Override
     public Status status() {
-        return new TopNOperatorStatus(inputQueue.size(), ramBytesUsed(), pagesReceived, pagesEmitted, rowsReceived, rowsEmitted);
+        return new TopNOperatorStatus(
+            receiveNanos,
+            emitNanos,
+            inputQueue.size(),
+            ramBytesUsed(),
+            pagesReceived,
+            pagesEmitted,
+            rowsReceived,
+            rowsEmitted
+        );
     }
 
     @Override

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/operator/topn/TopNOperatorStatus.java

@@ -25,6 +25,8 @@ public class TopNOperatorStatus implements Operator.Status {
         "topn",
         TopNOperatorStatus::new
     );
+    private final long receiveNanos;
+    private final long emitNanos;
     private final int occupiedRows;
     private final long ramBytesUsed;
     private final int pagesReceived;
@@ -33,13 +35,17 @@ public class TopNOperatorStatus implements Operator.Status {
     private final long rowsEmitted;
 
     public TopNOperatorStatus(
+        long receiveNanos,
+        long emitNanos,
         int occupiedRows,
         long ramBytesUsed,
         int pagesReceived,
         int pagesEmitted,
         long rowsReceived,
         long rowsEmitted
     ) {
+        this.receiveNanos = receiveNanos;
+        this.emitNanos = emitNanos;
         this.occupiedRows = occupiedRows;
         this.ramBytesUsed = ramBytesUsed;
         this.pagesReceived = pagesReceived;
@@ -49,6 +55,13 @@ public TopNOperatorStatus(
     }
 
     TopNOperatorStatus(StreamInput in) throws IOException {
+        if (in.getTransportVersion().onOrAfter(TransportVersions.ESQL_TOPN_TIMINGS)) {
+            this.receiveNanos = in.readVLong();
+            this.emitNanos = in.readVLong();
+        } else {
+            this.receiveNanos = 0;
+            this.emitNanos = 0;
+        }
         this.occupiedRows = in.readVInt();
         this.ramBytesUsed = in.readVLong();
 
@@ -67,6 +80,11 @@ public TopNOperatorStatus(
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
+        if (out.getTransportVersion().onOrAfter(TransportVersions.ESQL_TOPN_TIMINGS)) {
+            out.writeVLong(receiveNanos);
+            out.writeVLong(emitNanos);
+        }
+
         out.writeVInt(occupiedRows);
         out.writeVLong(ramBytesUsed);
 
@@ -83,6 +101,14 @@ public String getWriteableName() {
         return ENTRY.name;
     }
 
+    public long receiveNanos() {
+        return receiveNanos;
+    }
+
+    public long emitNanos() {
+        return emitNanos;
+    }
+
     public int occupiedRows() {
         return occupiedRows;
     }
@@ -110,6 +136,8 @@ public long rowsEmitted() {
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.startObject();
+        builder.field("receive_nanos", receiveNanos);
+        builder.field("emit_nanos", emitNanos);
         builder.field("occupied_rows", occupiedRows);
         builder.field("ram_bytes_used", ramBytesUsed);
         builder.field("ram_used", ByteSizeValue.ofBytes(ramBytesUsed));
@@ -126,7 +154,9 @@ public boolean equals(Object o) {
             return false;
         }
         TopNOperatorStatus that = (TopNOperatorStatus) o;
-        return occupiedRows == that.occupiedRows
+        return receiveNanos == that.receiveNanos
+            && emitNanos == that.emitNanos
+            && occupiedRows == that.occupiedRows
             && ramBytesUsed == that.ramBytesUsed
             && pagesReceived == that.pagesReceived
             && pagesEmitted == that.pagesEmitted
@@ -136,7 +166,7 @@ public boolean equals(Object o) {
 
     @Override
     public int hashCode() {
-        return Objects.hash(occupiedRows, ramBytesUsed, pagesReceived, pagesEmitted, rowsReceived, rowsEmitted);
+        return Objects.hash(receiveNanos, emitNanos, occupiedRows, ramBytesUsed, pagesReceived, pagesEmitted, rowsReceived, rowsEmitted);
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/topn/TopNOperatorStatusTests.java

@@ -16,12 +16,14 @@
 
 public class TopNOperatorStatusTests extends AbstractWireSerializingTestCase<TopNOperatorStatus> {
     public static TopNOperatorStatus simple() {
-        return new TopNOperatorStatus(10, 2000, 123, 123, 111, 222);
+        return new TopNOperatorStatus(100, 40, 10, 2000, 123, 123, 111, 222);
     }
 
     public static String simpleToJson() {
         return """
             {
+              "receive_nanos" : 100,
+              "emit_nanos" : 40,
               "occupied_rows" : 10,
               "ram_bytes_used" : 2000,
               "ram_used" : "1.9kb",
@@ -44,6 +46,8 @@ protected Writeable.Reader<TopNOperatorStatus> instanceReader() {
     @Override
     protected TopNOperatorStatus createTestInstance() {
         return new TopNOperatorStatus(
+            randomNonNegativeLong(),
+            randomNonNegativeLong(),
             randomNonNegativeInt(),
             randomNonNegativeLong(),
             randomNonNegativeInt(),
@@ -55,34 +59,51 @@ protected TopNOperatorStatus createTestInstance() {
 
     @Override
     protected TopNOperatorStatus mutateInstance(TopNOperatorStatus instance) {
+        long receiveNanos = instance.receiveNanos();
+        long emitNanos = instance.emitNanos();
         int occupiedRows = instance.occupiedRows();
         long ramBytesUsed = instance.ramBytesUsed();
         int pagesReceived = instance.pagesReceived();
         int pagesEmitted = instance.pagesEmitted();
         long rowsReceived = instance.rowsReceived();
         long rowsEmitted = instance.rowsEmitted();
-        switch (between(0, 5)) {
+        switch (between(0, 7)) {
             case 0:
-                occupiedRows = randomValueOtherThan(occupiedRows, ESTestCase::randomNonNegativeInt);
+                receiveNanos = randomValueOtherThan(receiveNanos, ESTestCase::randomNonNegativeLong);
                 break;
             case 1:
-                ramBytesUsed = randomValueOtherThan(ramBytesUsed, ESTestCase::randomNonNegativeLong);
+                emitNanos = randomValueOtherThan(emitNanos, ESTestCase::randomNonNegativeLong);
                 break;
             case 2:
-                pagesReceived = randomValueOtherThan(pagesReceived, ESTestCase::randomNonNegativeInt);
+                occupiedRows = randomValueOtherThan(occupiedRows, ESTestCase::randomNonNegativeInt);
                 break;
             case 3:
-                pagesEmitted = randomValueOtherThan(pagesEmitted, ESTestCase::randomNonNegativeInt);
+                ramBytesUsed = randomValueOtherThan(ramBytesUsed, ESTestCase::randomNonNegativeLong);
                 break;
             case 4:
-                rowsReceived = randomValueOtherThan(rowsReceived, ESTestCase::randomNonNegativeLong);
+                pagesReceived = randomValueOtherThan(pagesReceived, ESTestCase::randomNonNegativeInt);
                 break;
             case 5:
+                pagesEmitted = randomValueOtherThan(pagesEmitted, ESTestCase::randomNonNegativeInt);
+                break;
+            case 6:
+                rowsReceived = randomValueOtherThan(rowsReceived, ESTestCase::randomNonNegativeLong);
+                break;
+            case 7:
                 rowsEmitted = randomValueOtherThan(rowsEmitted, ESTestCase::randomNonNegativeLong);
                 break;
             default:
                 throw new IllegalArgumentException();
         }
-        return new TopNOperatorStatus(occupiedRows, ramBytesUsed, pagesReceived, pagesEmitted, rowsReceived, rowsEmitted);
+        return new TopNOperatorStatus(
+            receiveNanos,
+            emitNanos,
+            occupiedRows,
+            ramBytesUsed,
+            pagesReceived,
+            pagesEmitted,
+            rowsReceived,
+            rowsEmitted
+        );
     }
 }