Update .env.example to fix MILVUS_URI default value

[codingjaguar]

Summary

The MILVUS_URI with localhost is not reachable from another docker container. Changed to the special DNS name host.docker.internal to fix the problem.

See detailed issue report in
https://discord.com/channels/1160323594396635310/1335159004598370376/1335281419240607884

Screenshots

Before	After

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Fix the documentation about Milvus URI setting. dify-docs#472
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

We fix the CI in #13142, please rebase the origin/main :)

[codingjaguar]

We fix the CI in #13142, please rebase the origin/main :)

@crazywoola Done. Could you give it a review? Thanks!

[codingjaguar]

@crazywoola Another unrelated question: I saw MILVUS_ENABLE_HYBRID_SEARCH=False and image: milvusdb/milvus:v2.5.0-beta. Is that due to full text search in milvus 2.5.0 was a beta feature?

Now full text search in Milvus is mature with 2.5.4. Is that feasible to update the default config to milvusdb/milvus:v2.5.4 and turn on MILVUS_ENABLE_HYBRID_SEARCH by default?

[crazywoola]

@crazywoola Another unrelated question: I saw MILVUS_ENABLE_HYBRID_SEARCH=False and image: milvusdb/milvus:v2.5.0-beta. Is that due to full text search in milvus 2.5.0 was a beta feature?

Now full text search in Milvus is mature with 2.5.4. Is that feasible to update the default config to milvusdb/milvus:v2.5.4 and turn on MILVUS_ENABLE_HYBRID_SEARCH by default?

By turning this on will break previous installed dify I think.

[codingjaguar]

@crazywoola Another unrelated question: I saw MILVUS_ENABLE_HYBRID_SEARCH=False and image: milvusdb/milvus:v2.5.0-beta. Is that due to full text search in milvus 2.5.0 was a beta feature?

Now full text search in Milvus is mature with 2.5.4. Is that feasible to update the default config to milvusdb/milvus:v2.5.4 and turn on MILVUS_ENABLE_HYBRID_SEARCH by default?

By turning this on will break previous installed dify I think.

Got it. Then please ignore that. Can this PR get a review?

[zc277584121]

@crazywoola hello, the checks have passed, can you please take a review

[zc277584121]

@zxhlyh @crazywoola please review it, many thanks

[crazywoola]

Done @zc277584121 @codingjaguar