remove additional metric_type definition from diskann_config

[alwayslove2013]

just BaseConfig is ok.

knowhere/include/knowhere/config.h

Lines 649 to 655 in f0c16f4

	KNOHWERE_DECLARE_CONFIG(BaseConfig) {
	KNOWHERE_CONFIG_DECLARE_FIELD(metric_type)
	.set_default("L2")
	.description("metric type")
	.for_train_and_search()
	.for_iterator()
	.for_deserialize();

[mergify]

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[cqy123456]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.75%. Comparing base (3c46f4c) to head (99ecb02).
Report is 106 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #674       +/-   ##
=========================================
+ Coverage      0   71.75%   +71.75%     
=========================================
  Files         0       69       +69     
  Lines         0     4737     +4737     
=========================================
+ Hits          0     3399     +3399     
- Misses        0     1338     +1338     

see 69 files with indirect coverage changes

[alwayslove2013]

/kind improvement

[foxspy]

/lgtm

[sre-ci-robot]

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