fix 使用jdbc调用metaData.getColumnCount()函数无法获取正常列数信息的问题 #751 #752
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ElasticSearchResultSetMetaDataBase类中使用语句：
private final List columns = new ArrayList();
建立了自己的columns，但是并没有重写。但是其父类中已经创建了columns，由于ElasticSearchResultSetMetaDataBase类没有重写getColumnCount等函数，调用者使用相关功能时，实际上使用的是父类的columns对象，而非子类新创建的对象，从而导致无法获取列数等信息的问题。
本次修改在初始化columns时，直接使用父类已经初始化好的对象，统一父类与子类方法中的对象信息，修复该问题。并在本地测试环境中进行了验证。