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in I0272d56bc2e50e8174db78bd449f65f60f7f4000, we reset DEST value when installing elasticsearch. it gets set to /opt/stack/ which is not always correct in gate causing the path to be wrong and elasticseach cannot be installed. we should reuse DEST from stackrc Change-Id: Ia3a2383ada30c4e92c37386aedd6164c69cac60a Closes-Bug: #1484182