title: postgres index contains "unexpected zero page at block" exceptions
body: <p>I have following errors in pg_log file several thousand times. How to resolve them.</p>
  
  <pre><code>index "meeting_pkey" contains unexpected zero page at block 410.Please REINDEX it.
  index "faultevent_props_pkey" contains unexpected zero page at block 37290.
  index "faultevent_pkey" contains unexpected zero page at block 1704
  </code></pre>