public boolean containsCustomMappingForField(final String fieldName) {
        return stream().anyMatch(m -> m.fieldName().equals(fieldName));
    }
@Test
    void testContainsMappingForFieldWorksCorrectly() {
        CustomFieldMappings mapping = new CustomFieldMappings(List.of(
                new CustomFieldMapping("field1", "string"),
                new CustomFieldMapping("field2", "long")
        ));

        assertTrue(mapping.containsCustomMappingForField("field1"));
        assertTrue(mapping.containsCustomMappingForField("field2"));
        assertFalse(mapping.containsCustomMappingForField("bubamara!"));
    }