### Elasticsearch Version

main @ 4de2ffa2bcf9eba0b8d09fb5f13c217598d025ee

### Installed Plugins

_No response_

### Java Version

openjdk version "17.0.8" 2023-07-18

### OS Version

Ubuntu 23.04

### Problem Description

- `MvExpandOperator` is [leaving behind unclosed input blocks](https://github.com/elastic/elasticsearch/blob/4de2ffa2bcf9eba0b8d09fb5f13c217598d025ee/x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/MvExpandOperatorTests.java#L137-L142). Should be closed by #100548
- `LimitOperator` is [leaving behind unclosed input blocks](https://github.com/elastic/elasticsearch/blob/4de2ffa2bcf9eba0b8d09fb5f13c217598d025ee/x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/LimitOperatorTests.java#L100-L105). #100465
- `FilterOperator` is [leaving behind unclosed input blocks](https://github.com/elastic/elasticsearch/blob/4de2ffa2bcf9eba0b8d09fb5f13c217598d025ee/x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/FilterOperatorTests.java#L128-L134). Should be closed by https://github.com/elastic/elasticsearch/pull/100465

### Steps to Reproduce

Remove the overridden `canLeak` implementation from `MvExpandOperatorTests`, `LimitOperatorTests` or `FilterOperatorTests` and run them.

### Logs (if relevant)

_No response_
x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/OperatorTestCase.java
import org.elasticsearch.threadpool.TestThreadPool;
import org.elasticsearch.threadpool.ThreadPool;
import org.junit.AssumptionViolatedException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.LongStream;
import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.equalTo;
/**
 * Base tests for {@link Operator}s that are not {@link SourceOperator} or {@link SinkOperator}.
 */
public abstract class OperatorTestCase extends AnyOperatorTestCase {
    /**
     * Valid input to be sent to {@link #simple};
     */
    protected abstract SourceOperator simpleInput(BlockFactory blockFactory, int size);
    /**
     * Assert that output from {@link #simple} is correct for the
     * given input.
     */
    protected abstract void assertSimpleOutput(List<Page> input, List<Page> results);
    /**
     * A {@link ByteSizeValue} that is so small any input to the operator
     * will cause it to circuit break. If the operator can't break then
     * throw an {@link AssumptionViolatedException}.
     */
    protected abstract ByteSizeValue smallEnoughToCircuitBreak();
    /**