spec: Remove elasticsearch from BuildRequires
spec: Remove elasticsearch from BuildRequires

Since 5b5b57aa38ce799e56547383b45436444c2144b4 we don't need
elasticsearch anymore.

Change-Id: Ie89916b75273de2be821045c1c5f25e64490c316

redhat-cip/python-dciclient,redhat-cip/python-dciclient