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x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneOperator.java

@@ -34,6 +34,7 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
@@ -231,12 +232,20 @@ int position() {
     public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append(this.getClass().getSimpleName()).append("[");
-        sb.append("maxPageSize = ").append(maxPageSize);
+        sb.append("shards = ").append(sortedUnion(processedShards, sliceQueue.remainingShardsIdentifiers()));
+        sb.append(", maxPageSize = ").append(maxPageSize);
         describe(sb);
         sb.append("]");
         return sb.toString();
     }
 
+    private static Set<String> sortedUnion(Collection<String> a, Collection<String> b) {
+        var result = new TreeSet<String>();
+        result.addAll(a);
+        result.addAll(b);
+        return result;
+    }
+
     protected abstract void describe(StringBuilder sb);
 
     @Override

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneSliceQueue.java

@@ -15,6 +15,7 @@
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Queue;
@@ -45,8 +46,8 @@ public int totalSlices() {
         return totalSlices;
     }
 
-    public Iterable<LuceneSlice> getSlices() {
-        return slices;
+    public Collection<String> remainingShardsIdentifiers() {
+        return slices.stream().map(slice -> slice.shardContext().shardIdentifier()).toList();
     }
 
     public static LuceneSliceQueue create(

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneTopNSourceOperator.java

@@ -50,6 +50,7 @@
  * Source operator that builds Pages out of the output of a TopFieldCollector (aka TopN)
  */
 public final class LuceneTopNSourceOperator extends LuceneOperator {
+
     public static class Factory extends LuceneOperator.Factory {
         private final int maxPageSize;
         private final List<SortBuilder<?>> sorts;

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneCountOperatorTests.java

@@ -95,7 +95,7 @@ private LuceneCountOperator.Factory simple(DataPartitioning dataPartitioning, in
 
     @Override
     protected Matcher<String> expectedToStringOfSimple() {
-        return matchesRegex("LuceneCountOperator\\[maxPageSize = \\d+, remainingDocs=100]");
+        return matchesRegex("LuceneCountOperator\\[shards = \\[test], maxPageSize = \\d+, remainingDocs=100]");
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneMaxOperatorTestCase.java

@@ -195,7 +195,7 @@ private void testMax(Supplier<DriverContext> contexts, int size, int limit) {
 
     @Override
     protected final Matcher<String> expectedToStringOfSimple() {
-        return matchesRegex("LuceneMinMaxOperator\\[maxPageSize = \\d+, remainingDocs=100]");
+        return matchesRegex("LuceneMinMaxOperator\\[shards = \\[test\\], maxPageSize = \\d+, remainingDocs=100]");
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneMinOperatorTestCase.java

@@ -195,7 +195,7 @@ private void testMin(Supplier<DriverContext> contexts, int size, int limit) {
 
     @Override
     protected final Matcher<String> expectedToStringOfSimple() {
-        return matchesRegex("LuceneMinMaxOperator\\[maxPageSize = \\d+, remainingDocs=100]");
+        return matchesRegex("LuceneMinMaxOperator\\[shards = \\[test], maxPageSize = \\d+, remainingDocs=100]");
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneSourceOperatorTests.java

@@ -99,7 +99,7 @@ private LuceneSourceOperator.Factory simple(DataPartitioning dataPartitioning, i
 
     @Override
     protected Matcher<String> expectedToStringOfSimple() {
-        return matchesRegex("LuceneSourceOperator\\[maxPageSize = \\d+, remainingDocs = \\d+]");
+        return matchesRegex("LuceneSourceOperator\\[shards = \\[test], maxPageSize = \\d+, remainingDocs = \\d+]");
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneTopNSourceOperatorScoringTests.java

@@ -109,7 +109,9 @@ public Optional<SortAndFormats> buildSort(List<SortBuilder<?>> sorts) {
 
     @Override
     protected Matcher<String> expectedToStringOfSimple() {
-        return matchesRegex("LuceneTopNSourceOperator\\[maxPageSize = \\d+, limit = 100, scoreMode = COMPLETE, sorts = \\[\\{.+}]]");
+        return matchesRegex(
+            "LuceneTopNSourceOperator\\[shards = \\[test], maxPageSize = \\d+, limit = 100, scoreMode = COMPLETE, sorts = \\[\\{.+}]]"
+        );
     }
 
     @Override

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/LuceneTopNSourceOperatorTests.java

@@ -115,7 +115,9 @@ public Optional<SortAndFormats> buildSort(List<SortBuilder<?>> sorts) {
     @Override
     protected Matcher<String> expectedToStringOfSimple() {
         var s = scoring ? "COMPLETE" : "TOP_DOCS";
-        return matchesRegex("LuceneTopNSourceOperator\\[maxPageSize = \\d+, limit = 100, scoreMode = " + s + ", sorts = \\[\\{.+}]]");
+        return matchesRegex(
+            "LuceneTopNSourceOperator\\[shards = \\[test], maxPageSize = \\d+, limit = 100, scoreMode = " + s + ", sorts = \\[\\{.+}]]"
+        );
     }
 
     @Override

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/EsqlActionTaskIT.java

@@ -107,7 +107,7 @@ public void testTaskContents() throws Exception {
                 String taskDescription = status.taskDescription();
                 for (OperatorStatus o : status.activeOperators()) {
                     logger.info("status {}", o);
-                    if (o.operator().startsWith("LuceneSourceOperator[maxPageSize = " + pageSize())) {
+                    if (o.operator().startsWith("LuceneSourceOperator[")) {
                         assertThat(taskDescription, equalTo("data"));
                         LuceneSourceOperator.Status oStatus = (LuceneSourceOperator.Status) o.status();
                         assertThat(oStatus.processedSlices(), lessThanOrEqualTo(oStatus.totalSlices()));