Larger index size after Elasticsearch reindex

new index: GET _cat/shards/INDEXNAME
INDEXNAME2 p STARTED 18036844 24.6gb x.x.x.x xfg9Tzs
INDEXNAME2 r STARTED 18036844 24.6gb x.x.x.x opps4O9
INDEXNAME1 r STARTED 18040551 24.7gb x.x.x.x _8678PW
INDEXNAME1 p STARTED 18040551 24.7gb x.x.x.x ZNhGnBb
INDEXNAME0 r STARTED 18046281 24.6gb x.x.x.x yi-VARZ
INDEXNAME0 p STARTED 18046281 24.6gb x.x.x.x 8IOt5Hb

GET _cat/segments/NEWINDEX
audit_201801_1 0 r x.x.x.x _hoj 22915 18046281 0 24.6gb 55592211 true true 6.6.0 false
audit_201801_1 0 p x.x.x.x _hoj 22915 18046281 0 24.6gb 55592211 true true 6.6.0 false
audit_201801_1 1 r x.x.x.x _hok 22916 18040551 0 24.7gb 55578324 true true 6.6.0 false
audit_201801_1 1 p x.x.x.x _hok 22916 18040551 0 24.7gb 55578324 true true 6.6.0 false
audit_201801_1 2 p x.x.x.x _hoa 22906 18036844 0 24.6gb 55558178 true true 6.6.0 false
audit_201801_1 2 r x.x.x.x _hoa 22906 18036844 0 24.6gb 55558178 true true 6.6.0 false