Update Dockerfile (#1197)
Update Dockerfile (#1197)

upgrade wherehows es docker to 5.6.8
mars-lan/WhereHows,mars-lan/WhereHows,mars-lan/WhereHows,camelliazhang/WhereHows,alyiwang/WhereHows,mars-lan/WhereHows,linkedin/WhereHows,theseyi/WhereHows,camelliazhang/WhereHows,linkedin/WhereHows,alyiwang/WhereHows,theseyi/WhereHows,theseyi/WhereHows,linkedin/WhereHows,alyiwang/WhereHows,linkedin/WhereHows,theseyi/WhereHows,camelliazhang/WhereHows,camelliazhang/WhereHows,mars-lan/WhereHows,theseyi/WhereHows,alyiwang/WhereHows,theseyi/WhereHows,linkedin/WhereHows,alyiwang/WhereHows,mars-lan/WhereHows,camelliazhang/WhereHows,camelliazhang/WhereHows,linkedin/WhereHows,alyiwang/WhereHows