Use RabbitMQ for query processing

When a service we are depending on such as Elasticsearch fails, we will lose the queries (particularly via SMS that are costly) and will be unable to respond to the user.

Using RabbitMQ will allow storing the message in a queue and track the job until it is finished successfully on a number of retries or manually if intervention is needed.

该 issue 没有指明文件、测试或入口点。首先跟踪查询处理流程以及依赖 Elasticsearch 的 service，然后确定消息可以在哪里持久化和跟踪。完成的标准是：失败的查询会被保留、重试，并且能够被识别，直到成功完成或需要人工干预。

由索引模型根据 Issue 内容生成。