fix: potential missing index creation in merge process

[dantengsky]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

• in merge_into_mutator, write down inverted index (if necessary)

• in matched_mutator, write down bloom and inverted index, if nessary

• Fixes bug: bloom index may not be created during exec of merge into  #15669

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

---

This change is