Set index and type on percolate queries.

Eliminates the following exception:

```
org.elasticsearch.action.ActionRequestValidationException: Validation Failed: 1: index is missing;2: type is missing;
	at org.elasticsearch.action.ValidateActions.addValidationError(ValidateActions.java:29) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.action.percolate.PercolateRequest.validate(PercolateRequest.java:145) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.action.TransportActionNodeProxy.execute(TransportActionNodeProxy.java:63) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.client.transport.support.InternalTransportClient$2.doWithNode(InternalTransportClient.java:109) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:222) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.client.transport.support.InternalTransportClient.execute(InternalTransportClient.java:106) ~[elasticsearch-0.90.9.jar:na]
	at org.elasticsearch.client.transport.TransportClient.execute(TransportClient.java:306) ~[elasticsearch-0.90.9.jar:na]
	at com.sksamuel.elastic4s.ElasticClient.execute(Client.scala:56) ~[elastic4s_2.10-0.90.9.0.jar:0.90.9.0]
	at com.sksamuel.elastic4s.ElasticClient$$anonfun$execute$1.apply(Client.scala:52) ~[elastic4s_2.10-0.90.9.0.jar:0.90.9.0]
	at com.sksamuel.elastic4s.ElasticClient$$anonfun$execute$1.apply(Client.scala:52) ~[elastic4s_2.10-0.90.9.0.jar:0.90.9.0]
	at com.sksamuel.elastic4s.ElasticClient.injectFuture(Client.scala:279) ~[elastic4s_2.10-0.90.9.0.jar:0.90.9.0]
	at com.sksamuel.elastic4s.ElasticClient.execute(Client.scala:52) ~[elastic4s_2.10-0.90.9.0.jar:0.90.9.0]
```