Fix sniffer to use correct interval

The sniffing process, run by `sniffer` periodically, looks for nodes
added or removed from the cluster. However, it was run at the wrong
interval. We used the sniffing timeout instead of the sniffing interval
by mistake.

Update your clients if you see lots of calls to `_nodes/http`
in your log file.

See #332

CONTRIBUTORS

@@ -30,6 +30,7 @@ Harrison Wright [@wright8191](https://github.com/wright8191)
 Igor Dubinskiy [@idubinskiy](https://github.com/idubinskiy)
 Isaac Saldana [@isaldana](https://github.com/isaldana)
 Jack Lindamood [@cep21](https://github.com/cep21)
+Jayme Rotsaert [@jrots](https://github.com/jrots)
 Joe Buck [@four2five](https://github.com/four2five)
 John Barker [@j16r](https://github.com/j16r)
 John Goodall [@jgoodall](https://github.com/jgoodall)

client.go

@@ -21,7 +21,7 @@ import (
 
 const (
 	// Version is the current version of Elastic.
-	Version = "3.0.43"
+	Version = "3.0.44"
 
 	// DefaultUrl is the default endpoint of Elasticsearch on the local machine.
 	// It is used e.g. when initializing a new Client without a specific URL.
@@ -681,9 +681,10 @@ func (c *Client) dumpResponse(resp *http.Response) {
 func (c *Client) sniffer() {
 	c.mu.RLock()
 	timeout := c.snifferTimeout
+	interval := c.snifferInterval
 	c.mu.RUnlock()
 
-	ticker := time.NewTicker(timeout)
+	ticker := time.NewTicker(interval)
 	defer ticker.Stop()
 
 	for {