[fix](gson) avoid gson serde with EsRepository

[morningman]

Proposed changes

To avoid error like:

class org.apache.doris.external.elasticsearch.EsRepository declares multiple JSON fields named runnable

Problem summary

Describe your changes.

Checklist(Required)

• Does it affect the original behavior
• Has unit tests been added
• Has document been added or modified
• Does it need to update dependencies
• Is this PR support rollback (If NO, please explain WHY)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[morningman]

run buildall

[morningman]

run buildall

[hello-stephen]

TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 35.03 seconds
stream load tsv: 429 seconds loaded 74807831229 Bytes, about 166 MB/s
stream load json: 24 seconds loaded 2358488459 Bytes, about 93 MB/s
stream load orc: 60 seconds loaded 1101869774 Bytes, about 17 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20230509180851_clickbench_pr_141240.html

[morningman]

run buildall

[yiguolei]

LGTM