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From: Adrien Grand <jpountz@gmail.com>
Date: Thu, 24 Dec 2015 13:50:17 +0000
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Subject: Re: problem with payload retrieval in custom query - lucene 5.3.1
To: java-user@lucene.apache.org
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Note that payloads are stored per position, not per document. Maybe the
problem is that you never call docs.nextPosition()?

Le mer. 23 d=C3=A9c. 2015 =C3=A0 19:30, Bob Price <rjprice72@gmail.com> a =
=C3=A9crit :

> Via elasticsearch 2.1 we have written a custom Lucene TokenFilter that ad=
ds
> a payload to a special term during indexing analysis, and we also have
> custom Lucene Query/Weight/Scorer classes that compare this payload again=
st
> some query data to decide if a document matches a query or not.
>
> I know that the payloads are being written as desired since I can easily
> see them via elasticsearch's termvector API.
>
> However, while our Scorer can see all of the documents with this special
> term, I can never get access to its payload.
>
> The approach to doing this in the Scorer is simply:
>
> docs =3D leafReaderContext.reader().postings(specialTerm,
> PostingsEnum.PAYLOADS);
>
> Then, walking through the docs via nextDoc() and trying to retrieve each
> doc's payload via:
>
> BytesRef payloadRef =3D docs.getPayload();
> if (payloadRef !=3D null) {
>    byte[] payload =3D payloadRef.bytes;
>
> }
>
> I have logging in place so that I see that every document I have in a tes=
t
> index is being looked at, but for every document, the payloadRef comes ba=
ck
> null.
>
> What am I doing wrong?  Is there some setting I need to enable somewhere =
to
> allow the postings method to do what it says it can do?
>
> Is there a better way to do this?
>
> Any advice would be appreciated!
>
> Bob
>

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