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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,6 @@

import java.io.Closeable;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
Expand Down Expand Up @@ -316,7 +315,7 @@ public Map<String, Object> usageStats() {
stats.put("evictions", cacheStats.getEvictions());
stats.put("hits_time_in_millis", TimeValue.nsecToMSec(hitsTimeInNanos.sum()));
stats.put("misses_time_in_millis", TimeValue.nsecToMSec(missesTimeInNanos.sum()));
return Collections.unmodifiableMap(stats);
return stats;
}

private static final class BitsetCacheKey {
Expand Down