Add script to enable slowlog

It is enabled for both query and fetch phases of searching, as well as
for bulk index requests

Author: orangejulius

enable_slowlog.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "enabling slowlog for searching and indexing on $cluster_url"
+
+curl -XPUT "$cluster_url/_cluster/settings" -d '{
+  "persistent": {
+    "index.search.slowlog.threshold.query.warn": "10s",
+    "index.search.slowlog.threshold.query.info": "5s",
+    "index.search.slowlog.threshold.query.info": "2s",
+    "index.search.slowlog.threshold.query.info": "500ms",
+    "index.search.slowlog.source": true,
+
+    "index.search.slowlog.threshold.fetch.warn": "10s",
+    "index.search.slowlog.threshold.fetch.info": "5s",
+    "index.search.slowlog.threshold.fetch.info": "2s",
+    "index.search.slowlog.threshold.fetch.info": "500ms",
+
+    "index.index.slowlog.threshold.index.warn": "10s",
+    "index.index.slowlog.threshold.index.info": "5s",
+    "index.index.slowlog.threshold.index.info": "2s",
+    "index.index.slowlog.threshold.index.info": "500ms"
+  }
+}'