public Builder removeFiles(int index) {
                if (filesBuilder_ == null) {
                    ensureFilesIsMutable();
                    files_.remove(index);
                    onChanged();
                } else {
                    filesBuilder_.remove(index);
                }
                return this;
            }
<code>repeated .jraft.LocalSnapshotPbMeta.File files = 2;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/LocalStorageOutter.java