private CoverageAggregator adjustActiveDocs(int numMissingNodes) {
        if (answeredNodesParticipated > 0) {
            answeredActiveDocs += (numMissingNodes * answeredActiveDocs / answeredNodesParticipated);
            answeredTargetActiveDocs += (numMissingNodes * answeredTargetActiveDocs / answeredNodesParticipated);
        }
        return this;
    }
Aggregates coverage as responses are added.

@author baldersheim
container-search/src/main/java/com/yahoo/search/dispatch/CoverageAggregator.java