fix: enable Elasticsearch full text search support

[zhangyj21-lh]

Description

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How Has This Been Tested?

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Checklist:

• My code follows the style guidelines of this project
• I have already rebased the commits and make the commit message conform to the project standard.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules

[zhangyj21-lh]

1、 修复了DBGPT全文存储类型保存的问题（https://github.com/eosphoros-ai/DB-GPT/issues/2941）
2、修复了Elasticsearch关键词检索（https://github.com/eosphoros-ai/DB-GPT/issues/2946）

[zhangyj21-lh]

出现的问题：1、DBGPT全文存储配置上之后，上传文档会提示参数数量错误，full_text /elasticsearch.py中aload_document(self, chunks: List[Chunk])函数：这里只给了2个参数，实际上传入3个参数，因此会报错
2、我按照文档连接好了Elasticsearch（测试显示连接成功），在配置文件里面配置了
#FullText
[rag.storage.full_text]
type = "elasticsearch"
host="127.0.0.1"
port=9201（9200端口被占用换了这个）。在创建知识库时选择full text，还是无法启用全文检索，提示2025-12-08 11:30:22 supermicro dbgpt.storage.base[2022238]WARNING Full text search is not supported in this index store.
2025-12-08 11:30:22 supermicro dbgpt_serve.rag.retriever.knowledge_space[2022238]WARNING Full text search is not supported for this stor
age connector.
作以上修改之后，关键词检索成功：

[chenliang15405]

@zhangyj21-lh hi please fix code format, use make fmt and make fmt-check

[zhangyj21-lh]

@zhangyj21-lh hi please fix code format, use make fmt and make fmt-check

@chenliang15405 hi, I have committed the code after the check. Please check it.

[chenliang15405]

LGTM

[Aries-ckt]

LGTM, thanks for your contribution.