Elasticsearch get position of phrase in document -

i'm working on project need full-text search book. need search in 1 book @ time , need offset of search term beginning of book. need site that's powered django/python think elasticsearch better , faster.

so far haven't used elasticsearch directly through abstraction layer django-haystack.

edit1: need display users not text searching link them text. should work search box in preview on mac. users see search results surrounding text , if click on redirected js part of book, text located.

will simple highlighting suffice? if not, brute-force solution set highlighting pre_tags programmably-identifiable value , calculate offset that. speed setting term_vector with_positions_offsets in mapping use lucene's fast-vector-highlighter:

{     "type_name" : {         "content" : {"term_vector" : "with_positions_offsets"}     } } 

if that's not acceptable, check out this answer information on how offsets stored internally.

edit: based on edit, i'm not sure how having offset much. mean, unless you're displaying preformatted text or other fixed layout, how know on rendered page offset corresponds?

i think elegant solution use pre_tags , post_tags wrap matched text in elements. use javascript assign each match id, creating new fragment identifiers can set location.