title: How can I eliminate "linearScan by position" warnings?
body: <p>I just upgraded from Chronicle Queue 4.6.109 to 5.16.16. Since the upgrade I noticed many warnings of the following form in all of our services that use Chronicle Queue:</p>
  
  <blockquote>
    <p>2018-10-16 16:26:58,524 WARN  [main                     ] SCQIndexing          Took 256 us to linearScan by position from 379578902 to 379580588 = (0x169ff0ac-0x169fea16)=1686<br/>
    2018-10-16 16:29:19,130 WARN  [main                     ] SCQIndexing           Took 315 us to linearScan by position from 411040047 to 411042086 = (0x18800126-0x187ff92f)=2039<br/>
    2018-10-16 16:29:40,121 WARN  [main                     ] SCQIndexing          Took 73 us to linearScan by position from 415383606 to 415388071 = (0x18c251a7-0x18c24036)=4465<br/>
    2018-10-16 16:34:03,655 WARN  [main                     ] SCQIndexing          Took 310 us to linearScan by position from 478146209 to 478150976 = (0x1c800140-0x1c7feea1)=4767<br/>
    ...</p>
  </blockquote>
  
  <p>Is this something to really worry about or just used for (internal) profiling? Is there anything I can change in my code to eliminate these warnings, i.e. reduce the scan time (except setting the property chronicle.queue.report.linear.scan.latency to false)?</p>