SolR is not able to index entirely Creo drawings (drw files) when the compression option COMPRESS_OUTPUT_FILES=YES is activated in the config.pro as described in SPR 2262752
With this option, the texts are compressed into binary data. SolR is not able to uncompress it.
Due to this issue the index search result is uncomplete (misses all the drawings having the same search text inside) and users cannot trust in results
An uncomplete search result is an unusable result!
SolR must include this "uncompress" ability