Index Template 的匹配优先级

myapp-prod-2026真实匹配上了两个模板的index_patterns:
  tpl_low  (priority=10)  → number_of_shards: 3
  tpl_high (priority=100) → number_of_shards: 1

GET /myapp-prod-2026/_settings
→ number_of_shards = 1     ← 真实是tpl_high生效了，priority数值更大的赢

真实先建了index_patterns匹配"logs-app-*"、priority=100的模板，
本机ES 8.15.0自带了一个系统模板"logs"，index_patterns是"logs-*-*"、priority同样是100。

PUT /_index_template/tpl_high {"index_patterns":["logs-app-*"], "priority":100, ...}
→ 400 illegal_argument_exception:
  "index template [tpl_high] has index patterns [logs-app-*] matching patterns from
   existing templates [logs] with patterns (logs => [logs-*-*]) that have the same
   priority [100], multiple index templates may not match during index creation,
   please use a different priority"