Make minimum text length configurable and actually remove elasticsearch documents

doc/source/config_template/main.yaml

@@ -70,6 +70,12 @@ crawl:
     # Allowed values: positive number
     #feed_crawl_interval: 86400
 
+    # Minimum length of the text (in characters) extracted from
+    # a resource; resources with shorter texts are not stored.
+    # Default value: 300
+    # Allowed values: positive number
+    #min_text_length: 300
+
 # Parameters for access to the ElasticSearch service
 # No default values; must be set.
 elasticsearch:

src/atextcrawler/config.py

@@ -278,6 +278,7 @@ schema_crawl = Schema(
         Required('resource_delay', default=5): positive_number,
         Required('full_crawl_interval', default=864000): positive_number,
         Required('feed_crawl_interval', default=86400): positive_number,
+        Required('min_text_length', default=300): positive_number,
     }
 )
 

src/atextcrawler/resource/operations.py

@@ -143,7 +143,7 @@ async def process_site_path(
     """
     Fetch a path, deduplicate and if canonical, update and index the resource.
 
-    Return whether a new resource was handled that should contribute be
+    Return whether a new resource was handled that should contribute to
     statistics.
     """
     msg = (
@@ -241,10 +241,17 @@ async def _handle_text_resource(
 
     # find resources similar to the current text
     text = resource.search_fields['text']
-    if len(text) < 300:  # discard resources with too short texts
-        site_path.resource_id = None
+
+    # discard resources with too short texts
+    if len(text) < app.config['crawl']['min_text_length']:
+        await site_path.unlink_resource(
+            conn,
+            app.search_engine,
+            app.config['elasticsearch']['index_base_name'],
+        )
         await site_path.save(conn)
         return False, False
+
     simhash = simhash_from_bigint(resource.simhash)
     index = site.simhash_index
     similar_ids = search_simhash(index, simhash)