remove outdated log entry cache

src/lib/replication/log_store/home_raft_log_store.cpp

@@ -189,6 +189,13 @@ void HomeRaftLogStore::write_at(ulong index, nuraft::ptr< nuraft::log_entry >& e
     {
         std::unique_lock lk(m_mutex);
         m_log_entry_cache[position_in_cache] = std::make_pair(index, entry);
+
+        // remove all cached entries after this index
+        for (size_t i{0}; i < m_log_entry_cache.size(); ++i) {
+            if (m_log_entry_cache[i].first > index) {
+                m_log_entry_cache[i] = std::make_pair(0, nullptr);
+            }
+        }
     }
 
     // flushing the log before returning to ensure new(over-written) log is persisted to disk.