Is it necessary to unsubscribe from observables created by Http methods to avoid memory leaks?

Do you need to unsubscribe from Angular 2 http calls to prevent memory leak?

fetchFilm(index) {
var sub = this._http.get(`http://example.com`)
.map(result => result.json())
.map(json => {
dispatch(this.receiveFilm(json));
})
.subscribe(e=>sub.unsubscribe());
...

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