the Index still exists after it has been deleted about milvus-sdk-java

[youny626]

Hi, could you provide the IndexType of theIndex you created and the Index returned by describeIndex? Also, which version of Milvus server did you use?
When you drop an index, the IndexType will be changed to FLAT. So describeIndex will still return an Index.
I just tested again and it seems okay.

[shenchenguo]

You are right.When I drop an index, the IndexType will be changed to FLAT.
I created Index and then describe it as this:

then drop the Index:

then describe the index of table 'example' again:

the version of Milvus server is 0.5.1

[yhmo]

Let me explain this. Assume we have an empty table, its index type is default: FLAT. Then user insert 1M vectors into the table. The vectors are stored as 'raw data', one by one write into 'raw file'. If user perform a search action, milvus will do brute-force search. And then user create index SQ8, milvus will generate 'index file' for each 'raw file', the table index type changes to: SQ8, all search action become index-search(much faster than brute-force search). Now, user drop index, milvus will delete all 'index file', the table index type changes to FALT, but the 'raw file' is sill kept, all search action become brute-force search again.