availableProcessors is already set to [8], rejecting [8]

错误详细信息:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticsearchClient' 
defined in class path resource [org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchAutoConfiguration.class]: 
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'elasticsearchClient' threw exception; 
nested exception is java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]

关键信息如下:

Caused by: java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]

通过关键字搜索，找到了解决办法，原因是因为SpringBoot的netty和elasticsearch的netty相关jar冲突

只需在启动类加入如下代码即可解决(注意，这段代码要放在SpringApplication.run(Application.class, args)之前才行，否则不会生效):

System.setProperty("es.set.netty.runtime.available.processors", "false");