…ues (#1897)

sort_facet.md displays which query configuration utilizes docvalues and,
through a test scenario, illustrates the trade-off between the increase
in index size and the performance advantage gained in return.

---------

Co-authored-by: Abhinav Dangeti <abhinav@couchbase.com>

In case a document is not found, a nil check is required since
`doc.StoredFieldsBytes()` then results in a panic.

- Added timeout value, which the user can pass through request
parameters
 - Create context with the timeout value if present
 - Change the call to SearchInContext

Normalization of accented letters only happens if the input is larger
than 5 characters, something that, for example, neither `guía` nor
`fría` comply.
The solution would be to always execute the accented characters
normalization, by moving it to a separate file just like it is done in
the german analyzer.

Fixes: #1956