Return Elasticsearch highlight results in position order?
So after doing a bit of playing around, I discovered that the fast-vector-highlighter will natively sort the fragments in order of appearance in the original document. To enable this, I needed to add "term_vector" : "with_positions_offsets" to my synopsis field mapping.
{ "properties" : { "synopsis" : { "type" : "string", "term_vector": "with_positions_offsets" } }}and then use my highlight query as so:
{ "query": { "match": { "synopsis": "foo" } }, "highlight": { "fields": { "synopsis": { "type": "fvh", "fragment_size": 150, "number_of_fragments": 4 } } }}NOTE: Using "order" : "score" would cause the ordering to follow the the scoring schema, which does not necessarily follow start position offset order. I believe the exact code for this comparator can be found here, which seems to base it on the fragment's boost and then its startoffset.