new mapping using the persistence API

src/mapping.py

@@ -0,0 +1,37 @@
+from elasticsearch_dsl import DocType, Date, Nested, Boolean, \
+    analyzer, InnerObjectWrapper, Completion, Keyword, Text, Object
+
+from elasticsearch_dsl.connections import connections
+
+connections.create_connection(hosts=["localhost"])
+
+class TextBook(InnerObjectWrapper):
+    pass
+
+class Section(InnerObjectWrapper):
+    pass
+
+class Course(DocType):
+    textbook = Object(
+        doc_class=TextBook,
+        properties = {
+            "author" : Text(),
+            "title" : Text(),
+            "price" : Text()
+        }
+    )
+
+    sections = Object(
+            doc_class=Section,
+            properties = {
+                "sem" : Keyword(),
+                "title" : Text(),
+                "prof" : Text(),
+                "loc" : Text(),
+                "time" : Text(),
+                "day" : Text()
+                }
+            )
+
+    class Meta:
+        index = "course_test"