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[docs] Add tiebreaker field configuration to context docs (#12270)

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Felix Stürmer 2017-06-15 11:53:21 +02:00 • committed by GitHub
parent da13db257b
commit 383be943ff
1 changed files with 23 additions and 3 deletions
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26
docs/discover/context.asciidoc
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@ -15,13 +15,33 @@ image::images/Expanded-Document.png[Expanded Document]
The context view displays a number of documents before and after the anchor
document. The anchor document itself is highlighted in blue. The view is sorted
by the time field specified in the index pattern configuration and uses the
same set of columns as the Discover view the context was opened from.
same set of columns as the Discover view the context was opened from. If there
are multiple documents with the same time field value, the internal document
order is used as a secondary sorting criterion by default.
[NOTE]
--
The field used for tiebreaking in case of equal time field values can be
configured using the advanced setting `context:tieBreakerFields` in
<<advanced-options, *Management > Advanced Settings*>>, which defaults to the
`_doc` field. The value of this setting can be a comma-separated list of field
names, which will be checked in sequence for suitability when a context is
about to be displayed. The first suitable field is then used as the tiebreaking
field. A field is suitable if the field exists and is sortable in the index
pattern the context is based on.
While not required, it is recommended to only
use fields which have {es-ref}doc-values.html[doc values] enabled to achieve
good performance and avoid unnecessary {es-ref}modules-fielddata.html[field
data] usage. Common examples for suitable fields include log line numbers,
monotonically increasing counters and high-precision timestamps.
--
image::images/Discover-ContextView.png[Context View]
NOTE: The number of documents displayed by default can be configured
via the `context:defaultSize` setting in <<advanced-options, *Management >
Advanced Options*>>.
Advanced Settings*>>.
=== Changing the Context Size
@ -44,7 +64,7 @@ image::images/Discover-ContextView-SizePicker-Older.png[]
NOTE: The default number of documents loaded with each button click can be
configured via the `context:step` setting in <<advanced-options, *Management >
Advanced Options*>>.
Advanced Settings*>>.
=== Filtering the Context