Increase max_result_window and prevent swapping (#1018)

* Increase max_result_window to 5000000

This is until we switch to the scroll API. We can't access pages after
~2000 without increasing it.

* Increase jvm heap ram

* Prevent elasticsearch from being swapped

deploy/ansible/group_vars/all

@@ -13,5 +13,5 @@ nyaapantsu_elasticsearch_old_index: CHANGETHIS
 nyaapantsu_torrent_tablename: torrents
 # nyaapantsu_torrent_tablename: torrents_sukebei
 nyaapantsu_max_open_files: 200000
-nyaapantsu_jvm_heapsize_gb: 1
+nyaapantsu_jvm_heapsize_gb: 8
 # vim: ft=yaml

deploy/ansible/roles/elasticsearch/files/elasticsearch_settings.yml

@@ -36,7 +36,7 @@ settings:
   index:
     number_of_shards: 1
     number_of_replicas: 0
-    max_result_window: 30000
+    max_result_window: 5000000
 
 mappings:
   torrents:

deploy/ansible/roles/elasticsearch/tasks/main.yml

@@ -46,6 +46,13 @@
     line: 'ES_JAVA_OPTS="-Xms{{ nyaapantsu_jvm_heapsize_gb }}g -Xmx{{ nyaapantsu_jvm_heapsize_gb }}g"'
   become: true
 
+- name: Lock elasticsearch memory
+  lineinfile:
+    path: /etc/elasticsearch/elasticsearch.yml
+    regexp: '^bootstrap.memory_lock: true'
+    line: 'bootstrap.memory_lock: true'
+  become: true
+
 - name: Create override folder
   file:
     path: /etc/systemd/system/elasticsearch.service.d/

deploy/ansible/roles/elasticsearch/templates/elasticsearch.override.j2

@@ -1,3 +1,6 @@
 [Service]
 LimitNOFILE=
 LimitNOFILE={{ nyaapantsu_max_open_files }}
+
+LimitMEMLOCK=
+LimitMEMLOCK=infinity