[chore](config) set config enable_write_index_searcher_cache default to false, and set config inverted_index_searcher_cache_limit default to 5%

[Tanya-W]

Proposed changes

Issue Number: close #xxx

Problem summary

index_searcher_cache is cache file descriptor of inverted index, if open file descriptor limit of the Linux system is set too small and config inverted_index_searcher_cache_limit is too big, during high pressure load maybe cause "Too many open files".

So set config enable_write_index_searcher_cache default to false, and reduce config inverted_index_searcher_cache_limit default to 5%.

It is recommended to open enable_write_index_searcher_cache when the query pressure is greater than the write pressure.

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

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...

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[qidaye]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"