### 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/test/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapperTests.java
checker.registerConflictCheck(
            "index",
            fieldMapping(b -> b.field("type", "dense_vector").field("dims", 4).field("index", true).field("similarity", "dot_product")),
            fieldMapping(b -> b.field("type", "dense_vector").field("dims", 4).field("index", false))
        );
        checker.registerConflictCheck(
            "element_type",
            fieldMapping(
                b -> b.field("type", "dense_vector")
                    .field("dims", 4)
                    .field("index", true)
                    .field("similarity", "dot_product")
                    .field("element_type", "byte")
            ),
            fieldMapping(
                b -> b.field("type", "dense_vector")
                    .field("dims", 4)
                    .field("index", true)
                    .field("similarity", "dot_product")
                    .field("element_type", "float")
            )
        );
        checker.registerConflictCheck(
            "index_options",
            fieldMapping(b -> b.field("type", "dense_vector").field("dims", 4).field("index", true).field("similarity", "dot_product")),
            fieldMapping(
                b -> b.field("type", "dense_vector")
                    .field("dims", 4)
                    .field("index", true)
                    .field("similarity", "dot_product")