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DOCS-14819 Add SEARCH_META variable that populates from mongot #5888

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DOCS-14819 Add SEARCH_META variable that populates from mongot #5888

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DOCS-14819 Add SEARCH_META variable that populates from mongot
kanchana-mongodb Sep 27, 2021
ededc03
DOCS-15819 updates for tech review feedback
kanchana-mongodb Oct 19, 2021
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13 changes: 13 additions & 0 deletions source/reference/aggregation-variables.txt
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Expand Up @@ -107,6 +107,19 @@ MongoDB offers the following system variables:

- One of the allowed results of a :pipeline:`$redact` expression.

* - .. variable:: SEARCH_META

- A variable that stores the metadata results of an :atlas:`Atlas
Search </atlas-search/>` query. In all supported aggregation
pipeline stages, a field set to the variable
:variable:`$$SEARCH_META` returns the :atlas:`metadata results
</reference/atlas-search/query-syntax/#metadata-result-types>`
for the query.

For an example of its usage, see Atlas Search :atlas:`facet
</reference/atlas-search/facet/#search_meta-aggregation-variable>`
and :atlas:`count </reference/atlas-search/counting/#search_meta-aggregation-variable>`.

.. seealso::

- :expression:`$let`
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