Removing context.message.topic field

[eyalkoren]

Based on the update in elastic/apm#143, there is no context.message.topic anymore.
Required in:

• JMS
• Kafka
• Context serialization
• Do we want to remove JMS from its incubating state?

[videnkz]

Hi @eyalkoren , should we remove "topic" from span name?

[eyalkoren]

Hi @kananindzya 🙂 !
You mean for JMS? I think not- JMS uses queues and topics for different purposes, so it makes sense that the name of the spans will indicate that. This issue is about removing the context.message.topic.name field and using only context.message.queue.name, because it will always either be one or the other.