Fix documentation examples: missing json format, default client uses SSL (#222)

* Correct documentation to match `http::transport::DEFAULT_ADDRESS`

* add missing `json` format to cat index query

Author: eldad

README.md

@@ -94,7 +94,7 @@ Build a transport to make API requests to Elasticsearch using the `TransportBuil
 which allows setting of proxies, authentication schemes, certificate validation, and
 other transport related settings.
 
-To create a client to make API calls to Elasticsearch running on `http://localhost:9200`
+To create a client to make API calls to Elasticsearch running on `https://localhost:9200`
 
 ```rust,no_run
 use elasticsearch::Elasticsearch;

docs/overview.asciidoc

@@ -30,7 +30,7 @@ The Elasticsearch Rust client is forward compatible; meaning that the client sup
 [discrete]
 === Create a client
 
-To create a client to make API calls to Elasticsearch running on `\http://localhost:9200`
+To create a client to make API calls to Elasticsearch running on `\https://localhost:9200`
 
 [source,rust]
 ----
@@ -87,4 +87,4 @@ for hit in response_body["hits"]["hits"].as_array().unwrap() {
     // print the source document
     println!("{:?}", hit["_source"]);
 }
-----
+----

elasticsearch/src/lib.rs

@@ -108,7 +108,7 @@
 //!
 //! ## Create a client
 //!
-//! To create a client to make API calls to Elasticsearch running on `http://localhost:9200`
+//! To create a client to make API calls to Elasticsearch running on `https://localhost:9200`
 //!
 //! ```rust,no_run
 //! # use elasticsearch::Elasticsearch;