@Override
  public boolean seek(ExtendedCell key) throws IOException {
    if (checkFlushed()) {
      reopenAfterFlush();
    }
    return this.heap.seek(key);
  }
Filters the given list of scanners using Bloom filter, time range, and TTL.
<p>
Will be overridden by testcase so declared as protected.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java