Indexing Solr, Multiple Doc Types. Production of Multiple Values for UniqueKey Field Using TemplateTransformer

[Naska Osmani]

Hello,

I want to index multiple tables of a database into a single solr index. 
I used TemplateTransformer to concatenate a prefix, the id of the table 
or entity with the uniqueKey uid so that entities don't overwrite 
eachother. The documents don't get indexed with the error message:

org.apache.solr.common.SolrException: Document contains multiple values 
for uniqueKey field: uid=[A_1, dc1999fcf12df900]
    at 
org.apache.solr.update.AddUpdateCommand.getIndexedId(AddUpdateCommand.java:91)
    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:464)
    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:346)
    at 
org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:100)
    at 
org.apache.solr.update.processor.SignatureUpdateProcessorFactory$SignatureUpdateProcessor.processAdd(SignatureUpdateProcessorFactory.java:194)
    at 
org.apache.solr.handler.dataimport.SolrWriter.upload(SolrWriter.java:70)
    at 
org.apache.solr.handler.dataimport.DataImportHandler$1.upload(DataImportHandler.java:235)
    at 
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:500)
    at 
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:404)
    at 
org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:319)
    at 
org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:227)
    at 
org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:422)
    at 
org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:487)
    at 
org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:468)

Here is part of my schema.xml:
<fields>
    <field name="aid" type="string" multiValued="true"/>
    <field name="aname" type="string" indexed="true" stored="true" 
omitNorms="true" termVectors="true" multiValued="true"/>
    <field name="acountry" type="string" indexed="true" stored="true" 
omitNorms="true" termVectors="true" multivalued="true" />

    <field name="bid" type="string" multiValued="true"/>
    <field name="bname" type="string" indexed="true" stored="true" 
omitNorms="true" termVectors="true" multiValued="true"/>
    <field name="bcountry" type="string" indexed="true" stored="true" 
omitNorms="true" termVectors="true" multivalued="true" />

    <field name="uid" type="string"/>

    <field name="doc_type" type="string"/>

    <field name="allText" type="text_general" indexed="true" 
stored="true" multiValued="true" omitNorms="true" termVectors="true" />
</fields>
<uniqueKey>uid</uniqueKey>

And my data-config.xml:
<document name="doc">
        <entity name="atest" pk="id" transformer="TemplateTransformer"
         query="SELECT id, name, country FROM atests">
            <field column="uid" name="uid" template="A_${atest.id}"/>
            <field column="doc_type" template="ATEST"/>
            <field column="id" name="aid"/>
            <field column="name" name="aname"/>
            <field column="country" name="acountry"/>
        </entity>
        <entity name="btest" pk="id" transformer="TemplateTransformer"
                query="SELECT id, name, country FROM btests">
            <field column="uid" template="B_${btest.id}"/>
            <field column="doc_type" template="BTEST"/>
            <field column="id" name="bid"/>
            <field column="name" name="bname"/>
            <field column="country" name="bcountry"/>
        </entity>
</document>

I have tried to set multivalued to true or false or earase it in aid and 
bid fields but this didn't solve the issue.

Thanks in advance