### 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/DynamicMappingTests.java
"field2": {
                            "type": "text",
                            "fields": {
                              "keyword": {
                                "type": "keyword",
                                "ignore_above": 256
                              }
                            }
                          }
                        }
                      },
                      "field1": {
                        "type": "text",
                        "fields": {
                          "keyword": {
                            "type": "keyword",
                            "ignore_above": 256
                          }
                        }
                      }
                    }
                  }
                }
              }
            }"""), Strings.toString(doc.dynamicMappingsUpdate()));
    }
    public void testDynamicRuntimeDotsInFieldNames() throws IOException {
        DocumentMapper documentMapper = createDocumentMapper(dynamicMapping("runtime", builder -> {}));
        ParsedDocument doc = documentMapper.parse(source(b -> {
            b.field("one.two.three.four", "1234");