private void putSevenEntries() {
    Region<String, Integer> region = getCache().getRegion(regionName);
    for (int i = 0; i < 7; i++) {
      region.put("key" + i, i);
    }
  }
The Clear operation during a NetSearchMessage.doGet() in progress can cause DiskAccessException
by accessing cleared oplogs and eventually destroy region. The Test verifies that fix prevents
this.

<p>
Test must be DistributedTest because it requires ClusterDistributionManager.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClearDuringNetSearchOplogRegressionTest.java