elasticsearch5/src/main/java/site/ycsb/db/elasticsearch5/ElasticsearchClient.java [312:322]:
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    if (isRefreshNeeded) {
      final boolean refresh;
      synchronized (this) {
        if (isRefreshNeeded) {
          refresh = true;
          isRefreshNeeded = false;
        } else {
          refresh = false;
        }
      }
      if (refresh) {
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elasticsearch5/src/main/java/site/ycsb/db/elasticsearch5/ElasticsearchRestClient.java [399:409]:
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    if (isRefreshNeeded) {
      final boolean refresh;
      synchronized (this) {
        if (isRefreshNeeded) {
          refresh = true;
          isRefreshNeeded = false;
        } else {
          refresh = false;
        }
      }
      if (refresh) {
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