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From Shai Erera <ser...@gmail.com>
Subject Re: FacetsConfig usage
Date Sun, 05 Oct 2014 16:59:00 GMT
Hi

The FacetsConfig object is the one that you use to index facets, and at
search time it is consulted about the facets attributes (multi-valued,
hierarchical etc.). You can make changes to the FacetsConfig, as long as
they don't contradict the indexed data in a problematic manner.

Usually the facets configuration does not change, but I believe it will
work if you add new dimensions. Current in-flight searches won't
query/count those dimensions anyway, and new searches will find those
dimensions in recently indexed documents only. It is up to you to decide if
the old 1 million documents that don't contain the new Person facet are OK
to display together w/ the 10 new documents that do, but as long as you're
OK with that, application-wise, adding new dimensions should just work.

Contradicting changes are changes to the attributes of one dimension, e.g.
from hierarchical to flat. In that case, that that there are 1 million old
documents indexed w/ A/B/C hierarchy and 10 new documents w/ only A/B
doesn't matter to the FacetsConfig - all documents will be considered flat
in that case. Here I'm less sure about the effects of that on search (I
don't think we have a test for it), but I hope that you don't do that. It's
not advisable, just like any other schema changes to your fields while
there are already indexed documents.

Shai

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