ci: Disable Elasticsearch disk allocation decider

.github/workflows/ci.yml

@@ -68,6 +68,11 @@ jobs:
           docker compose up setup
           docker compose up -d
 
+      # Elasticsearch's high disk watermark gets regularly exceeded on GitHub Actions runners.
+      # https://www.elastic.co/guide/en/elasticsearch/reference/8.10/fix-watermark-errors.html
+      - name: Disable Elasticsearch disk allocation decider
+        run: .github/workflows/scripts/disable-disk-alloc-decider.sh
+
       - name: Execute core test suite
         run: .github/workflows/scripts/run-tests-core.sh
 

.github/workflows/scripts/disable-disk-alloc-decider.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -eu
+set -o pipefail
+
+
+source "${BASH_SOURCE[0]%/*}"/lib/testing.sh
+
+
+cid_es="$(container_id elasticsearch)"
+ip_es="$(service_ip elasticsearch)"
+
+grouplog 'Wait for readiness of Elasticsearch'
+poll_ready "$cid_es" "http://${ip_es}:9200/" -u 'elastic:testpasswd'
+endgroup
+
+log 'Disabling disk allocation decider'
+
+declare -a put_args=( '-X' 'PUT' '--fail-with-body' '-s' '-u' 'elastic:testpasswd'
+	'-H' 'Content-Type: application/json'
+	"http://${ip_es}:9200/_cluster/settings?pretty"
+	'-d' '{"persistent":{"cluster.routing.allocation.disk.threshold_enabled":false}}'
+)
+declare response
+declare -i exit_code=0
+
+response=$(curl "${put_args[@]}") || exit_code=$?
+echo "$response"
+
+exit $exit_code