Amend description of `use_index` on `/{db}/_find`
The semantics of Mango's `use_index` query parameter has changed
over time but this has not been reflected in the documentation,
which causes a lot of confusion.
The `use_index` parameter was introduced in 1b0426aa to force the
index selection to a specific index. Unfortunately, this did not
work out well in practice, so 743bd882 added a fallback mechanism
to make it less brittle. With that, `use_index` became only a
"hint" not an "instruction".
1 file changed
