public void setConnectionId(String connectionId) {
        this.connectionId = connectionId;
    }
<p>
The identifier of the connection that a specific client is using.
</p>

@param connectionId
       The identifier of the connection that a specific client is using.
aws-java-sdk-apigatewaymanagementapi/src/main/java/com/amazonaws/services/apigatewaymanagementapi/model/PostToConnectionRequest.java