I'm seeing some major performance difference depending on if I wrap my filter
in a query. I don't understand, because the docs say to use filters for exact
matching.
This query takes about 800ms, even after repeated executions (so caches are
hot):
{ "filter": { "term": { "ProjectId": 4191152 } },
"from": 0, "size": 50,
"sort": [], "facets": {}
}
But slapping query filtered around it makes it take 5ms on repeated executions:
{ "query": { "filtered": {
"filter": { "term": { "ProjectId": 4191152 } } } },
"from": 0, "size": 50,
"sort": [], "facets": {}
}
What am I misunderstanding? I've got 80M documents, 30 of which match this
query, so the only thing I can guess is that somehow when I don't use a "query"
element at the root, Elasticsearch retrieves every document and applies my
filter, versus using some indexed approach when using query.
-Michael
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