deep query does not filter properly

[klahnakoski]

the nested filter is not inserted into the ES query:

{
	"from":"treeherder.job_log.failure_line",
	"select":["expected","status","test"],
	"where":[
		{"eq":{"failure.classification":"intermittent"}},
		{"gte":{"action.start_time":{"date":"today-2week"}}},
		{"ne":{"run.result":"success"}},
		{"eq":{"action":"test_result"}},
		{"exists":"test"}
	],
	"limit":10
}

[klahnakoski]

...specifically, the ES query is not filtering out missing test