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What is causing the 'SolrException: Schema Parsing Failed: unknown field' error?

xml,solr,lucene,solr-schema
I am attempting to configure a SOLR 4.7.1 single instance, single core setup and on startup SOLR throws an error: Schema Parsing Failed: unknown field 'INVENTORY_ITEM_ID'. Schema file is /var/solr/cores/intota-inventory/schema.xml I believe SOLR is complaining that the <uniqueKey> has not been defined in schema.xml. I say this because whatever field...

SolrException Plugin init failure for [schema.xml] fieldType “pint”: Error loading class 'solr.IntField'

apache,solr,tomcat7,bigdata,solr-schema
I am getting this error collection1: org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: Could not load conf for core collection1: Plugin init failure for [schema.xml] fieldType "pint": Error loading class 'solr.IntField'. when i am trying to import collection 1 (solr 4.5) schema to solr 5.1. I only copy collection 1 from different machine where solr 4.5...

Can not search in the field which I defined in schema.xml like copyField

search,solr,solr-schema
I've added to the schema.xml the multivalued field in the following way: <field name="text_qs" type="text" indexed="true" stored="false" multiValued="true"/> And added two fields to it: <copyField source="name" dest="text_qs"/> <copyField source="symbol" dest="text_qs"/> After that I perform indexing of the solr, restart it, but still I can not search in this field text_qs....