Apache Solr Reference Guide Covering Apache Solr 6.0

[
{
"id": "1",
"title": "Solr adds block join support",
"content_type": "parentDocument",
"_childDocuments_": [
{
"id": "2",
"comments": "SolrCloud supports it too!"
}
]
},
{
"id": "3",
"title": "New Lucene and Solr release is out",
"content_type": "parentDocument",
"_childDocuments_": [
{
"id": "4",
"comments": "Lots of new features"
}
]
}
]
Note
One limitation of indexing nested documents is that the whole block of parent-children documents must
be updated together whenever any changes are required. In other words, even if a single child document
or the parent document is changed, the whole block of parent-child documents must be indexed
together.
Uploading Data with Solr Cell using Apache Tika
Solr uses code from the Apache Tika project to provide a framework for incorporating many different file-format
parsers such as Apache PDFBox and Apache POI into Solr itself. Working with this framework, Solr's Extracti
ngRequestHandler can use Tika to support uploading binary files, including files in popular formats such as
Word and PDF, for data extraction and indexing.
When this framework was under development, it was called the Solr Content Extraction Library or CEL; from that
abbreviation came this framework's name: Solr Cell.
If you want to supply your own ContentHandler for Solr to use, you can extend the ExtractingRequestHan
dler and override the createFactory() method. This factory is responsible for constructing the SolrConten
tHandler that interacts with Tika, and allows literals to override Tika-parsed values. Set the parameter litera
lsOverride, which normally defaults to *true, to *false" to append Tika-parsed values to literal values.
For more information on Solr's Extracting Request Handler, see https://wiki.apache.org/solr/ExtractingRequestH
andler.
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