Streaming API Developer Guide

Getting Started with Streaming API
Code Examples
Client Connection Considerations
PushTopic Events (Legacy)
Working with PushTopics
PushTopic Queries
Event Notification Rules
Replay PushTopic Streaming Events
Filtered Subscriptions
Bulk Subscriptions
Deactivating a Push Topic
PushTopic Considerations
PushTopic Streaming Allocations
Reference: PushTopic
Generic Events (Legacy)
Monitoring Event Usage
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Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Deactivating a Push Topic

You can temporarily deactivate a PushTopic, rather than deleting it, by setting the isActive field to false.

To deactivate a PushTopic by Id, execute the following Apex code: 
1PushTopic pt = new PushTopic(Id='0IFD0000000008jOAA', IsActive = false);
2update(pt);