### Description

Dynamic mappings can greatly help the getting started experience but they currently don't apply to all types, one example is `dense_vector`.

It's been suggested to automatically map float arrays as dense vectors when there are more than 100 values, or a heuristic along these lines.
server/src/main/java/org/elasticsearch/index/mapper/DocumentParser.java
return NO_OP_FIELDMAPPER;
        }
        return null;
    }
    private static final FieldMapper NO_OP_FIELDMAPPER = new FieldMapper(
        "no-op",
        new MappedFieldType("no-op", false, false, false, TextSearchInfo.NONE, Collections.emptyMap()) {
            @Override
            public ValueFetcher valueFetcher(SearchExecutionContext context, String format) {
                throw new UnsupportedOperationException();
            }
            @Override
            public String typeName() {
                throw new UnsupportedOperationException();
            }
            @Override
            public Query termQuery(Object value, SearchExecutionContext context) {
                throw new UnsupportedOperationException();
            }
        },
        FieldMapper.MultiFields.empty(),
        FieldMapper.CopyTo.empty()
    ) {
        @Override
        protected void parseCreateField(DocumentParserContext context) {
            
        }
        @Override
        public String name() {
            throw new UnsupportedOperationException();