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[Discover][docs] Add search for relevance (#90611) (#92910)

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Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>
Co-authored-by: Lisa Cawley <lcawley@elastic.co>

Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>
Co-authored-by: Lisa Cawley <lcawley@elastic.co>
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Matthias Wilhelm 2021-02-25 22:06:19 +01:00 • committed by GitHub
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[[discover-search-for-relevance]]
== Search for relevance
Sometimes you might be unsure which documents best match your question.
{es} assigns a relevancy, or score to each document, so you can
can narrow your search to the documents with the most relevant results.
The higher the score, the better it matches your query.
For example, suppose you have the <<gs-get-data-into-kibana, sample flights data set>>, and you're a searching for
a flight that arrived or departed from `Warsaw` or `Venice` when the weather was clear.
. In *Discover*, open the index pattern dropdown, and select `kibana_sample_data_flight`.
. In the query bar, click *KQL*, and switch to the <<lucene-query, Lucene query syntax>>.
. Search for `Warsaw OR Venice OR Clear`.
. If you don't see any results, open the time filter and select a time range that contains data.
. From the list of *Available fields*, add `_score` to the document table.
. In the document table, click the header for the `_score` column, and then sort the column by descending scores.
+
The results are currently sorted by first `Time`, and then by `_score`.
. To sort only by `_score`, remove the `Time` field.
+
Your table now shows documents with the best matches, from most to least relevant.
+
[role="screenshot"]
image::images/discover-search-for-relevance.png["Example of a search for relevance"]

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docs/user/discover.asciidoc
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@ -198,7 +198,6 @@ image:images/visualize-from-discover.png[Visualization that opens from Discover
[float]
=== What’s next?
* <<kuery-query, Learn more about the structure of a KQL query>>.
* <<kibana-discover-settings, Configure Discover>> to better meet your needs.
@ -209,6 +208,8 @@ the table columns that display by default, and more.
* <<reporting-getting-started, Present your findings in a report>>.
* <<discover-search-for-relevance, Search for relevance>>.
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include::{kib-repo-dir}/management/index-patterns.asciidoc[]
@ -216,3 +217,5 @@ include::{kib-repo-dir}/management/index-patterns.asciidoc[]
include::{kib-repo-dir}/discover/set-time-filter.asciidoc[]
include::{kib-repo-dir}/discover/search.asciidoc[]
include::{kib-repo-dir}/discover/search-for-relevance.asciidoc[]