Documented the /suggest endpoint

docs/kiwix-serve.rst

@@ -417,7 +417,49 @@ resources by using explicit ``cacheid`` s.
 ``/suggest``
 ------------
 
-Blablabla
+**Usage:**
+
+  ``/suggest?content=ZIMNAME[&term=QUERY][&count=N][&start=S]``
+
+Returns suggestions (in JSON format) for a text string that is assumed to be a
+partially typed search for a page inside a particular ZIM file.
+
+Suggestions are obtained as matches of the query text against the page titles
+in the ZIM file using the title index database generated during the creation of
+the ZIM file.
+
+In case of a multi-word query the order of the words matters in two ways:
+
+1. the last word is considered as partially typed, unless followed by a space;
+2. ranking of the matches.
+
+If the ZIM file doesn't contain a title index then suggestions are generated by
+listing page titles starting *exactly* (in a case sensitive manner) with the
+query text. Otherwise, suggestions are case-insensitive.
+
+If the ZIM file contains a full text search index, then an extra suggestion is
+added as an option to perform a full text search in the said ZIM file.
+
+**Parameters:**
+
+  ``content`` (mandatory): :term:`name <ZIM name>` of the ZIM file.
+
+  ``term`` (optional; defaults to an empty string): query text.
+
+  ``count`` (optional, default: 10): maximum number of page suggestions in the
+  response (i.e. the extra option to perform a full text search is not included
+  in this count).
+
+  ``start`` (optional, default: 0): this parameter enables pagination of
+  results. The response will include up to ``count`` entries starting with
+  entry # ``start`` from the full list of page suggestions (the first result is
+  assumed to have index 0).
+
+**Example:**
+
+.. code:: sh
+
+  $ curl 'http://localhost/suggest?content=stackoverflow_en&term=pyth&count=50'
 
 
 .. _zim-file-viewer: