Thanks Matt.
It seems that we've done terrible things ... effectively `post_filter` is a
better name.
在 2013年12月31日星期二UTC+1上午12时16分43秒，Matt Weber写道：
>
> 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...@gmail.com <javascript:>
> > 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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>
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