When host specified as string url, default port is 80

[yaauie]

A bug was recently filed on the Logstash Elasticsearch Filter Plugin, indicating that specifying a schema in the host argument would cause the client to fail to provide the default port.

Defining a connection schema will override the default port (9200) for a given host.

Scenario: Elasticsearch node bound to loopback/localhost:

• hosts => ["localhost:9200"] - works
• hosts => ["localhost"] - works
• hosts => ["http://localhost"] - doesn't work

-- logstash-plugins/logstash-filter-elasticsearch#110

The issue is that when we send URI#parse(String), URI finds the http/https implementation of URI, each of which have default ports that get set on the instance.

URI.parse('http://localhost').port # => 80

Although it's not particularly clean, the following will always create a URI::Generic (which has no default port):

URI::Generic.new(*URI.split('http://localhost'))

[estolfo]

PR: #647

[estolfo]

Further updates:
#649
467f473