Updated ES install instructions [skip ci]
Updated ES install instructions [skip ci]

st0012/searchkick,Xtinct/searchkick,st0012/searchkick,Xtinct/searchkick,mikelkew/searchkick,spanner/searchkick,spanner/searchkick,ankane/searchkick,johan--/searchkick,johan--/searchkick,jprosevear/searchkick,jprosevear/searchkick,mikelkew/searchkick