Cannot index documents into Solr 8.1.1

I created a cloud Solr 8.1.1 with zookeeper similar to cloud Solr 6.6.2 which is in use. All configurations and schema files are exactly alike, but when I try to index the same documents Solr throws cannot change field "FIELD_NAME" from index options=DOCS_AND_FREQS_AND_POSITIONS to inconsistent index options=DOCS for a specific field which is of type string. It is a required field so cannot be omitted. 

For another Collection in the same core(Solr 8.1.1), Solr throws cannot change docValues type from SORTED_NUMERIC to SORTED for field "ANOTHER_FIELD_NAME" to the field of type string.

Note: It is indexing perfectly in the existing Solr i.e., 6.6.2