### CI Link

https://gradle-enterprise.elastic.co/s/sa7kgcpbjsuyo

### Repro line

./gradlew ':x-pack:plugin:esql:internalClusterTest' --tests "org.elasticsearch.xpack.esql.action.EsqlActionTaskIT.testCancelRead" -Dtests.seed=A10FD59C7183AD95 -Dbuild.snapshot=false -Dtests.jvm.argline="-Dbuild.snapshot=false" -Dtests.locale=ga-IE -Dtests.timezone=Europe/Stockholm -Druntime.java=20

### Does it reproduce?

No

### Applicable branches

main

### Failure history

_No response_

### Failure excerpt

```
org.elasticsearch.xpack.esql.action.EsqlActionTaskIT > testCancelRead FAILED
    java.lang.AssertionError: 
    Expected: a collection with size <2>
         but: collection size was <0>
        at __randomizedtesting.SeedInfo.seed([A10FD59C7183AD95:34226718C99014F4]:0)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
        at org.junit.Assert.assertThat(Assert.java:956)
        at org.junit.Assert.assertThat(Assert.java:923)
        at org.elasticsearch.xpack.esql.action.EsqlActionTaskIT.lambda$getTasksStarting$2(EsqlActionTaskIT.java:229)
        at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1196)
        at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1169)
        at org.elasticsearch.xpack.esql.action.EsqlActionTaskIT.getTasksStarting(EsqlActionTaskIT.java:221)
        at org.elasticsearch.xpack.esql.action.EsqlActionTaskIT.testCancelRead(EsqlActionTaskIT.java:167)
```
x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneOperator.java
}
            LuceneScorer scorer = operator.currentScorer;
            slicePosition = scorer != null ? scorer.position : 0;
            sliceSize = leaf != null ? leaf.maxDoc - leaf.minDoc : 0;
            pagesEmitted = operator.pagesEmitted;
        }
        Status(int processedSlices, int totalSlices, int pagesEmitted, int slicePosition, int sliceSize) {
            this.processedSlices = processedSlices;
            this.totalSlices = totalSlices;
            this.slicePosition = slicePosition;
            this.sliceSize = sliceSize;
            this.pagesEmitted = pagesEmitted;
        }
        Status(StreamInput in) throws IOException {
            processedSlices = in.readVInt();
            totalSlices = in.readVInt();
            slicePosition = in.readVInt();
            sliceSize = in.readVInt();
            pagesEmitted = in.readVInt();
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {
            out.writeVInt(processedSlices);
            out.writeVInt(totalSlices);
            out.writeVInt(slicePosition);
            out.writeVInt(sliceSize);
            out.writeVInt(pagesEmitted);
        }
        @Override
        public String getWriteableName() {