added JestHttpClient logging information

[happyprg]

hello.
i use RoundrobinServerList by JestHttpClient.

normally, i think we need to know to below informations for the debugging.

1. elasticSearchRestUrl and method info.
2. requestBody as json string.

specially, when you use RoundRobinServer Method.
clearly need to know that information.
because according to the roundRobin method, change host at the call each time.

so i added logging information.
how are you thinking?

would you please to accept my pull request?
thank you.

[kramer]

They should probably be on debug level instead of info as it'll get too chatty otherwise 😄

[happyprg]

ok. i changed logging level to debug.
is it ok?

[kramer]

Should not create a new Gson instance and use the one set on the class instead (getGson()). Also why not just print entity; yes it won't be pretty printed but that is the actual entity and doing a json parse for the second time here is kinda wasteful.

[happyprg]

If you are using prettyPrint.
I think that you would help make it easier to read.

[happyprg]

what do you think,
change to modifier of JestHttpClient.createJsonStringEntity.
from private to protected

[happyprg]

after that,
possible below code.
e.g)
@OverRide
protected String createJsonStringEntity(Object data) {

    String createJsonStringEntity = super.createJsonStringEntity(data);

    JsonElement el = new JsonParser().parse(createJsonStringEntity);
    log.info("request body to json - " + System.getProperty("line.separator") + new GsonBuilder().setPrettyPrinting().create().toJson(el));

    return createJsonStringEntity;
}

}

[coveralls]

Coverage increased (+0.05%) when pulling 406a1a3 on happyprg:master into 48eeefe on searchbox-io:master.