1. change clucene version from 2.4.4->2.4.6 2. update build-thirdparty.sh clucene's build block, adding USE_BTHREAD CMAKE flag, this flag is inherited from doris's USE_BTHREAD_SCANNER.
1. change clucene version from 2.4.4->2.4.6 2. update build-thirdparty.sh clucene's build block, adding USE_BTHREAD CMAKE flag, this flag is inherited from doris's USE_BTHREAD_SCANNER.