Just got a bunch of instances of this suite timing out all on Windows agents. Could be a coincidence but seems unlikely.

**Build scan:**
https://gradle-enterprise.elastic.co/s/rvfpi7upehqjk/tests/:x-pack:plugin:esql:test/org.elasticsearch.xpack.esql.expression.function.scalar.nulls.CoalesceTests
**Reproduction line:**
```
null
```

**Applicable branches:**
main

**Reproduces locally?:**
Didn't try

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.esql.expression.function.scalar.nulls.CoalesceTests&tests.test=classMethod
**Failure excerpt:**
```
java.lang.Exception: Suite timeout exceeded (>= 2400000 msec).

  at __randomizedtesting.SeedInfo.seed([546AEE28130887AC]:0)

```
x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/AbstractFunctionTestCase.java
* </p>
     */
    private static void writeToTempDir(String subdir, String str, String extension) throws IOException {
        
        Path dir = PathUtils.get(System.getProperty("java.io.tmpdir")).resolve("esql").resolve("functions").resolve(subdir);
        Files.createDirectories(dir);
        Path file = dir.resolve(functionName() + "." + extension);
        Files.writeString(file, str);
    }
    private final List<CircuitBreaker> breakers = Collections.synchronizedList(new ArrayList<>());
    protected final DriverContext driverContext() {
        MockBigArrays bigArrays = new MockBigArrays(PageCacheRecycler.NON_RECYCLING_INSTANCE, ByteSizeValue.ofGb(1));
        CircuitBreaker breaker = bigArrays.breakerService().getBreaker(CircuitBreaker.REQUEST);
        breakers.add(breaker);
        return new DriverContext(bigArrays.withCircuitBreaking(), new BlockFactory(breaker, bigArrays));
    }
    protected final DriverContext crankyContext() {
        BigArrays bigArrays = new MockBigArrays(PageCacheRecycler.NON_RECYCLING_INSTANCE, new CrankyCircuitBreakerService());
        CircuitBreaker breaker = bigArrays.breakerService().getBreaker(CircuitBreaker.REQUEST);
        breakers.add(breaker);
        return new DriverContext(bigArrays.withCircuitBreaking(), new BlockFactory(breaker, bigArrays));
    }
    @After
    public void allMemoryReleased() {
        for (CircuitBreaker breaker : breakers) {
            assertThat(breaker.getUsed(), equalTo(0L));
        }
    }
}