Search feature completion

[ignasi35]

online-auciton-scala's version of the Search service is not as complete as the java equivalent in online-auction-java. For starters: there's no UI.

As raised in #68, there was a runtime issue fixed in #72. But #72 exposed another runtime issue:

$ curl -d'{"keywords":"chair","maxPrice":10, "currency":"USD"}' -X POST -H "Content-Type: application/json" "http://localhost:9000/api/search?pageNo=1&pageSize=10"

returns:

{"name":"UndeserializableException","detail":"{\"error\":{\"root_cause\":[{\"type\":\"parsing_exception\",\"reason\":\"[itemStatus] query malformed, no start_object after query name\",\"line\":1,\"col\":63}],\"type\":\"parsing_exception\",\"reason\":\"[itemStatus] query malformed, no start_object after query name\",\"line\":1,\"col\":63},\"status\":400}"}

[ryanhanks]

It looks like we have two tasks at-hand here:

1. Build a UI for searching auction items
2. Address runtime issue in SearchService.search (I've created Fix-up Elasticsearch integration #112 to discuss this separately).

When #112 is resolved, we should take a look at #113, which introduces a Search UI based on the Java implementation.

Let me know if you have any questions!