How does couchbase decided to cover an index. I have created two indexes but when i look into execution plan one is covered and other is not.
created index idx_123 on bucket( value1,value2,value3,value4,value5,value6) where type=“ABC”
Create index idx_324 on bucket (a,b,c,d) where type=“PQR”
What metrics does it consider for taking this decision?