红帽全球峰会226.5.6. 动态操作
Exchange 可以通过设置 CamelMongoDbOperation 标头（由 MongoDbConstants.OPERATION_HEADER 持续定义）来覆盖端点的固定操作。
支持的值由 MongoDbOperation 枚举决定，并与端点 URI 上的 operation 参数的接受值匹配。
例如：
// from("direct:insert").to("mongodb:myDb?database=flights&collection=tickets&operation=insert");
Object result = template.requestBodyAndHeader("direct:insert", "irrelevantBody", MongoDbConstants.OPERATION_HEADER, "count");
assertTrue("Result is not of type Long", result instanceof Long);
// from("direct:insert").to("mongodb:myDb?database=flights&collection=tickets&operation=insert");
Object result = template.requestBodyAndHeader("direct:insert", "irrelevantBody", MongoDbConstants.OPERATION_HEADER, "count");
assertTrue("Result is not of type Long", result instanceof Long);
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