"useCombiner" was introduced in which version ?

I am running version 0.7.1. The indexing spec as follow. However, the indexer does not pick up “useCombiner”. Is it version too old? Appreciate any advice.

“tuningConfig”: {

    "rowFlushBoundary": "200000",

    "type": "hadoop",

    "useCombiner": true,

 ....

}

}

useCombiner was added in 0.8.1.

Thanks Gian! I need to update our cluster.