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
try (ExpressionEvaluator ev = supplier.get(driverContext())) {
            assertThat(ev.toString(), equalTo(testCase.evaluatorToString));
        }
    }
    public final void testFold() {
        Expression expression = buildLiteralExpression(testCase);
        if (testCase.getExpectedTypeError() != null) {
            assertTrue(expression.typeResolved().unresolved());
            assertThat(expression.typeResolved().message(), equalTo(testCase.getExpectedTypeError()));
            return;
        }
        assertFalse(expression.typeResolved().unresolved());
        expression = new FoldNull().rule(expression);
        assertThat(expression.dataType(), equalTo(testCase.expectedType));
        assertTrue(expression.foldable());
        assertThat(expression.fold(), testCase.getMatcher());
        if (testCase.getExpectedWarnings() != null) {
            assertWarnings(testCase.getExpectedWarnings());
        }
    }
    public void testSerializationOfSimple() {
        assumeTrue("All test data types must be representable in order to build fields", testCase.allTypesAreRepresentable());
        assertSerialization(buildFieldExpression(testCase));
    }
    @AfterClass
    public static void testFunctionInfo() {
        FunctionDefinition definition = definition();
        if (definition == null) {
            LogManager.getLogger(getTestClass()).info("Skipping function info checks because the function isn't registered");
            return;