org.apache.solr.common.SolrException: Unknown fieldType 'long' specified on field _version_

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org.apache.solr.common.SolrException: Unknown fieldType 'long' specified on field _version_
at org.apache.solr.schema.IndexSchema.loadFields(IndexSchema.java:644)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:470)
at org.apache.solr.schema.IndexSchema.(IndexSchemaFactory.java:55)

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