@Test void coersesPort9300To9200() {
    assertThat(new InitialEndpointSupplier(HTTP, "localhost:9300").get())
      .isEqualTo(Endpoint.of("localhost", 9200));
  }
This helps ensure old setups don't break (provided they have http port 9200 open)
zipkin-server/src/test/java/zipkin2/server/internal/elasticsearch/InitialEndpointSupplierTest.java