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
if (testCase.getExpectedTypeError() != null) {
            return;
        }
        if (testCase.getData().stream().anyMatch(t -> t.type() == DataTypes.NULL)) {
            return;
        }
        signatures.putIfAbsent(testCase.getData().stream().map(TestCaseSupplier.TypedData::type).toList(), testCase.expectedType);
    }
    @AfterClass
    public static void renderTypesTable() throws IOException {
        if (System.getProperty("generateDocs") == null) {
            return;
        }
        FunctionDefinition definition = definition();
        if (definition == null) {
            LogManager.getLogger(getTestClass()).info("Skipping rendering types because the function isn't registered");
            return;
        }
        List<String> args = EsqlFunctionRegistry.description(definition).argNames();
        StringBuilder header = new StringBuilder();
        for (String arg : args) {
            header.append(arg).append(" | ");
        }
        header.append("result");
        List<String> table = new ArrayList<>();
        for (Map.Entry<List<DataType>, DataType> sig : signatures.entrySet()) {
            if (sig.getKey().size() != args.size()) {
                continue;
            }
            StringBuilder b = new StringBuilder();