Java SearchHits provides out-of-order results when sort order provided in query

Elastic Stack Elasticsearch
1

I'm using Elasticsearch 1.5.2, and after doing a search that specifies a sort order; when I run the generated JSON (as copied from the Java objects), the results appear in the desired sorted order.

However, when I extract search results as below, the results aren't in the same order.

Unless I'm doing something wrong here, I expect that this version of Elasticsearch perhaps is using a non-ordered Collection to store the search hits, causing this to happen. Does anyone know if this is the case, and if there's a workaround?

Incidentally, I have the source jar for this version of Elasticsearch, but for some reason the com.elasticsearch.search subpackage is not included in that source jar...

  • Tim

      // Run the query
  SearchResponse response = builder.execute().actionGet();

  // Scroll until no hits are returned
  List<Map<String, Object>> resultsList = new ArrayList<Map<String, Object>>();
  boolean done = false;
  while (!done) {
      response = getClient().prepareSearchScroll(response.getScrollId()).setScroll(TimeValue.timeValueMinutes(1))
              .execute().actionGet();

      for (SearchHit searchHit : response.getHits().getHits()) {

          Map<String, SearchHitField> fields = searchHit.getFields();

          Map<String, Object> document = new HashMap<String, Object>();

          for (Map.Entry<String, SearchHitField> entry : fields.entrySet()) {
              String name = entry.getKey();
              SearchHitField hitValue = entry.getValue();
              document.put(name, getSearchHitFieldValue(name, hitValue));
          }

          resultsList.add(document);
      }

      done = (response.getHits().getHits().length == 0);
  }
2

Nevermind, folks, I found out it's because I'm using the SCAN type query, which doesn't sort.

It pays to read ALL the documentation - sorry! :wink:

  • Tim