Hi everyone When I query a lucene index, I get back a list of document ids. This index search is fast. Now for all documents matching the result I need a unique String field called "id" which is stored in the document. From the documentation I gather that document ids are internal and I should not use them for referencing my own data structures. Currently I iterate over all the hits matching the document and then for each one I get the document to read the field using IndexReader.document(). http://lucene.apache.org/core/4_5_0/core/org/apache/lucene/index/IndexReader.html
I read the "id" field from the document and then use it further in my processing logic. The problem is that reading all documents to get all "id"'s is turning out to be very slow. It is the bottleneck in my application. It would be nice to have a way if lucene could return some metadata along with the internal document id when I did a search. I do not want to read all documents just to retrieve this metadata. The best solution I have come across searching on the net is to use payloads which will be returned by the fast index search query along with the document ids. Is my understanding correct that using payloads I can get "id" string field for all my documents faster than reading my entire document? I am not able to find a good example of how to store and retrieve payloads? Can you please point me to a good resource to learn how to use payloads and how they will impact performance? I am using Lucene 4.5. Thanks Rohit Banga http://iamrohitbanga.com/
