It looks like you didn't copy the index, just a few files.
And let's create splunk the index folder structure for you by adding the index to the index.conf an restart splunk.
When you do a move/copy of an index, copy everything, including colddb, db, hot, etc.
like the following commando
cp -rp ~/var/lib/splunk/<your_index> <path>/<to>/<your>/<storage>
or do a drag an drop on your windows system
The normal index structure looks like the follow
me@myserver:~/var/lib/splunk/elsurion> tree
.
├── colddb
├── datamodel_summary
├── db
│ │ ...
│ ├── db_1484138704_1484138344_99
│ │ ├── 1484138704-1484138344-5030796207003270706.tsidx
│ │ ├── bloomfilter
│ │ ├── bucket_info.csv
│ │ ├── Hosts.data
│ │ ├── optimize.result
│ │ ├── rawdata
│ │ │ ├── ournal.gz
│ │ │ ├── slicemin.dat
│ │ │ └── slicesv2.dat
│ │ ├── Sources.data
│ │ ├── SourceTypes.data
│ │ └── Strings.data
│ │ ...
│ ├── GlobalMetaData
│ └── hot_v1_143
│ ├── 1514495803-1514448509-617512707267247429.tsidx
│ ├── 1514532124-1514520088-9040980535112679088.tsidx
│ ├── 1514532128-1514532128-9049526622478475961.tsidx
│ ├── 1514532138-1514532138-9092459381857281969.tsidx
│ ├── 1514532139-1514532079-9096760486661566399.tsidx
│ ├── 1514532148-1514532148-9135411910970549314.tsidx
│ ├── 1514588396-1514495805-12721369008098433568.tsidx
│ ├── bucket_info.csv
│ ├── Hosts.data
│ ├── rawdata
│ │ ├── 6163361
│ │ ├── journal.gz
│ │ └── slicesv2.dat
│ ├── Sources.data
│ ├── SourceTypes.data
│ ├── splunk-need-optimize.dat
│ └── Strings.data
└── thaweddb
Also you have to pay attention to the dat file
me@myserver:~/var/lib/splunk> ls -al
...
drwx------ 6 splunk splunk 71 5. Feb 2016 elsurion
-rw------- 1 splunk splunk 3 28. Dez 09:08 elsurion.dat
In this dat file the indexer keeps records of the actual bucket. Edit it or just delete it (splunk adds it again with correct value when restarting) when creating an empty index before copy your old index over. Or copy the file with your index.
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