statistics: fix index isEvicted  (#35170)
statistics: fix index isEvicted  (#35170)

Signed-off-by: yisaer <f222f204032533a6fcbe6e5ff6aed541ec6b4541@163.com>

Co-authored-by: Ti Chi Robot <040e6455cde1c91e876ec337e785ce913eacba35@tidb.io>
ngaut/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb