[Bug]: Create DiskANN index with WithMmap true should return error

[ThreadDao]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

milvus: master-20240411-a938951e-amd64
sdk: go master

Create diskann index with mmap should return error: index type DISKANN does not support mmap

case:

func TestMmapIndexUnsupported(t *testing.T) {
	ctx := createContext(t, time.Second*common.DefaultTimeout*2)
	// connect
	mc := createMilvusClient(ctx, t)

	// create -> insert -> flush -> index -> load
	cp := CollectionParams{CollectionFieldsType: Int64FloatVec, AutoID: false, EnableDynamicField: false,
		ShardsNum: common.DefaultShards, Dim: common.DefaultDim}
	collName := createCollection(ctx, t, mc, cp)

	dp := DataParams{DoInsert: true, CollectionName: collName, CollectionFieldsType: Int64FloatVec, start: 0,
		nb: common.DefaultNb, dim: common.DefaultDim, EnableDynamicField: false}
	insertData(ctx, t, mc, dp)
	mc.Flush(ctx, collName, false)

	//create index with mmap
	idx, _ := entity.NewIndexDISKANN(entity.COSINE)
	err := mc.CreateIndex(ctx, collName, common.DefaultFloatVecFieldName, idx, false, client.WithMmap(true))
	common.CheckErr(t, err, false, "index type DISKANN does not support mmap")
}

Expected Behavior

No response

Steps To Reproduce

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Environment

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Anything else?

No response

[ThreadDao]

/assign @congqixia

[ThreadDao]

server milvus bug

[ThreadDao]

fixed