The "outer" filter is basically a post filter, ie. filtering happens after
all the documents have been collected via the query. This should not
really be used unless you are trying to do something like multi-select
faceting where you don't want facet counts to be affected by the filter.
You should be using a filtered query [1] or as you discovered a constant
score query if you only want to execute a filter.
BTW, in elasticsearch 1.0, this outer filter has been renamed to
"post_filter" to avoid some of the confusion.
Thanks,
Matt Weber
On Mon, Dec 30, 2013 at 2:53 PM, Han JU <ju.han.fe...@gmail.com> wrote:
> Hi,
>
> We are currently benchmarking our ES setup so I've got some new questions:
>
> 1. We found out that, for the same query (filter actually), when put like
> this:
>
> {
> "filter": {...},
> "fields": [...]
> }
>
> is consistently slower than this form:
>
> {
> "query": {
> "constant_score": {
> "filter": {...},
> ...
> }
> }
> }.
>
> All filter and fields part are identical, but the performance is
> different, especially when caches are warm, filters wrapped in a
> constant_score are nearly 10x faster than when they are put directly.
> So what happens behind this? How ElasticSearch interpret filters that are
> put directly (not wrapped in any outer structure)?
>
> Thanks in advance.
>
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