Apache Solr Reference Guide Covering Apache Solr 6.0

#core.properties
name=collection2
my.custom.prop=edismax
The my.custom.prop property can then be used as a variable, such as in solrconfig.xml:
${my.custom.prop}
Implicit Core Properties
Several attributes of a Solr core are available as "implicit" properties that can be used in variable substitution,
independent of where or how they underlying value is initialized. For example: regardless of whether the name
for a particular Solr core is explicitly configured in core.properties or inferred from the name of the instance
directory, the implicit property solr.core.name is available for use as a variable in that core's configuration
file...
${solr.core.name}
All implicit properties use the solr.core. name prefix, and reflect the runtime value of the equivalent core.pr
operties property:
solr.core.name
solr.core.config
solr.core.schema
solr.core.dataDir
solr.core.transient
solr.core.loadOnStartup
DataDir and DirectoryFactory in SolrConfig
Specifying a Location for Index Data with the dataDir Parameter
By default, Solr stores its index data in a directory called /data under the Solr home. If you would like to specify
a different directory for storing index data, use the parameter in the solrconfig.xml file. You can
specify another directory either with a full pathname or a pathname relative to the instance dir of the SolrCore.
For example:
/var/data/solr/
If you are using replication to replicate the Solr index (as described in Legacy Scaling and Distribution), then the
directory should correspond to the index directory used in the replication configuration.
Apache Solr Reference Guide 6.0
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