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/scalar/nulls/CoalesceTests.java
};
            }
            return EvalMapper.toEvaluator(child, layout);
        };
        try (
            EvalOperator.ExpressionEvaluator eval = exp.toEvaluator(map).get(driverContext());
            Block.Ref ref = eval.eval(row(testCase.getDataValues()))
        ) {
            assertThat(toJavaObject(ref.block(), 0), testCase.getMatcher());
        }
    }
    public void testCoalesceNullabilityIsUnknown() {
        assertThat(buildFieldExpression(testCase).nullable(), equalTo(Nullability.UNKNOWN));
    }
    public void testCoalesceKnownNullable() {
        List<Expression> sub = new ArrayList<>(testCase.getDataAsFields());
        sub.add(between(0, sub.size()), new Literal(Source.EMPTY, null, sub.get(0).dataType()));
        Coalesce exp = build(Source.EMPTY, sub);
        
        assertThat(exp.nullable(), equalTo(Nullability.UNKNOWN));
    }
    public void testCoalesceNotNullable() {
        List<Expression> sub = new ArrayList<>(testCase.getDataAsFields());
        sub.add(between(0, sub.size()), randomLiteral(sub.get(0).dataType()));
        Coalesce exp = build(Source.EMPTY, sub);
        
        assertThat(exp.nullable(), equalTo(Nullability.FALSE));
    }
}