Added http script for elastic settings updates.

ops/elasticsearch_settings.http

+### Make elasticsearch indixes writable, after storage run low and watermark check
+#   automatically set all indexes into read_only_allow_delete=true
+PUT http://localhost:19202/_all/_settings HTTP/1.1
+Content-Type: application/json
+
+{
+  "index.blocks.read_only_allow_delete": null
+}
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