https://bugzilla.wikimedia.org/show_bug.cgi?id=58098
Web browser: ---
Bug ID: 58098
Summary: CirrusSearch: Investigate removing stored from most
fields in Elasticsearch
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: CirrusSearch
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
Right now we tag most fields as stored in Elasticsearch but on further reading
we should really only tag the fields that we need for prefix searching. The
reason for this is that during full text search we actually would load most of
the _source document any way when you measure by size by virtue of highlighting
the text. Once you load most of the _source you may as well get everything
from it.
In other words, setting a field to stored only speeds up queries that *don't*
highlight or return the text but *do* highlight or return the stored field. It
actually slows down things that *do* highlight the text because it involves
multiple loads. Also, it takes up extra disk space.
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