Fix protocol.io search [SCI-8286]

- Reduce the number of displayed publications to 20 for speed
- Clear the search result each time a new key (search sentence) is used

app/assets/javascripts/protocols/protocolsio.js

@@ -123,7 +123,7 @@ function applySearchCallback() {
   $('form.protocols-search-bar').off('ajax:success').off('ajax:error')
     .bind('ajax:success', function(evt, data) {
       var listWrapper = $('.list-wrapper');
-      if (data.page_id > 1) {
+      if (data.page_id > 2) {
         // Remove old load more button since we will append a new one
         $('.show-more-protocols-btn').remove();
         $('.list-wrapper').append(data.html);

app/utilities/protocol_importers/protocols_io/v3/api_client.rb

@@ -18,12 +18,12 @@ module ProtocolImporters
         end
 
         # Query params available are:
-        #   filter (optional): {public|user_public|user_private|shared_with_user}
+        #   filter (required): {public|user_public|user_private|shared_with_user}
         #     Which type of protocols to filter.
         #     default is public and requires no auth token.
         #     user_public requires public token.
         #     user_private|shared_with_user require private auth token.
-        #   key (optional): string
+        #   key (required): string
         #     Search key to search for in protocol name, description, authors.
         #     default: ''
         #   order_field (optional): {activity|date|name|id}

config/initializers/constants.rb

@@ -278,7 +278,7 @@ class Constants
       },
       publications: {
         default_query_params: {
-          latest: 50
+          latest: 20
         }
       }
     },