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add note about document keys using simple collation (#6153)
* add note about document keys using simple collation * fix link
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source/includes/extracts-collation.yaml

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@@ -168,7 +168,13 @@ content: |-
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.. code-block:: javascript
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db.myColl.find( { score: 5, category: "cafe" } )
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.. important::
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Matches against document keys, including embedded document keys,
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use simple binary comparison. This means that a query for a key
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like "foo.bár" will not match the key "foo.bar", regardless of the value you
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set for the :ref:`strength <collation-parameter-strength>` parameter.
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---
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ref: collation-index

source/reference/collation.txt

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@@ -61,13 +61,15 @@ parameters and the locales they are associated with, see
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To specify simple binary comparison, specify ``locale`` value of
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``"simple"``.
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* - ``strength``
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- integer
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- Optional. The level of comparison to perform.
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- .. _collation-parameter-strength:
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Optional. The level of comparison to perform.
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Corresponds to `ICU Comparison Levels
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<http://userguide.icu-project.org/collation/concepts#TOC-Comparison-Levels>`_.
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Possible values are:

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