### Description

The date_xxx() arguments have been swapped to always have the field parameter last. This has been done to align with other implementations of similar functionality (which users would be accustomed to).
This issue is a reminder to remove this warning once any existing usages have been corrected.

Related: #98624, #99561.
x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/AnalyzerTests.java
public void testUnsupportedFieldUsedExplicitly() {
        assertProjectionWithMapping("""
            from test
            | keep foo_type
            """, "mapping-multi-field-variation.json", "foo_type");
    }
    public void testUnsupportedFieldTypes() {
        assertProjectionWithMapping("""
            from test
            | keep unsigned_long, date, date_nanos, unsupported, point, version
            """, "mapping-multi-field-variation.json", "unsigned_long", "date", "date_nanos", "unsupported", "point", "version");
    }
    public void testUnsupportedDottedFieldUsedExplicitly() {
        assertProjectionWithMapping("""
            from test
            | keep some.string
            """, "mapping-multi-field-variation.json", "some.string");
    }
    public void testUnsupportedParentField() {
        verifyUnsupported(
            """
                from test
                | keep text, text.keyword
                """,
            "Found 1 problem\n" + "line 2:14: Unknown column [text.keyword], did you mean any of [text.wildcard, text.raw]?",
            "mapping-multi-field.json"
        );
    }
    public void testUnsupportedParentFieldAndItsSubField() {
        assertProjectionWithMapping("""