search: add custom query parser to specify search field

cern_search_rest_api/config.py

@@ -103,6 +103,7 @@ RECORDS_REST_ENDPOINTS = dict(
             'application/json': ('invenio_records_rest.serializers'
                                  ':json_v1_search'),
         },
+        search_factory_imp='cern_search_rest_api.modules.cernsearch.search.csas_search_factory',
         max_result_window=10000,
         read_permission_factory_imp=record_read_permission_factory,
         list_permission_factory_imp=record_list_permission_factory,

cern_search_rest_api/modules/cernsearch/search.py

@@ -8,6 +8,7 @@
 # or submit itself to any jurisdiction.
 
 from elasticsearch_dsl import Q
+from invenio_records_rest.query import default_search_factory
 from invenio_search import RecordsSearch
 from invenio_search.api import DefaultFilter
 from flask import request, current_app
@@ -75,6 +76,20 @@ def get_egroups():
     return get_user_provides()
 
 
+def search_factory(self, search, query_parser=None):
+
+    def _csas_query_parser(qstr=None):
+        """Default parser that uses the Q() from elasticsearch_dsl."""
+        if qstr:
+            return Q('query_string', query=qstr, default_field='_search_all')
+        return Q()
+
+    return default_search_factory(self, search, _csas_query_parser)
+
+
+csas_search_factory = search_factory
+
+
 class RecordCERNSearch(RecordsSearch):
     """CERN search class."""