SearchHit is an elasticsearch class. It describes a hit from which you can get the JSON Source document.
You need to convert the JSON content to your Pojo.
You can use Jackson to deserialize from JSON to Pojo.
Something like:
ObjectMapper mapper = new ObjectMapper();
timeRange.add(mapper.readValue(hit.getSourceAsString(), LogLineEntry.class));
BTW If you are a Hibernate user, the latest versions of Hibernate do that also automatically.