protected boolean isReusable() {
        return true;
    }
Checks whether the connection is reusable or not. This method will be called
in
{@link ClickHouseHttpClient#checkConnection(ClickHouseHttpConnection, ClickHouseNode, ClickHouseNode, ClickHouseRequest)}
for making a decision of whether to create a new connection. In addition to
that, if a connection is NOT reusable, it will be closed right after
corresponding ClickHouseResponse is closed.

@return true if it's reusable; false otherwise
clickhouse-http-client/src/main/java/com/clickhouse/client/http/ClickHouseHttpConnection.java