Trey Grainger updated SOLR-9480:
    Attachment: SOLR-9480.patch

Initial patch to get the ball rolling here. Feature should now work as 
described in reference links in the description. Only real changes are an 
update from Solr 5.1.0 to master, and cleanup of most of the precommit issues.

Still plenty of work to do, particularly in reworking some of the 
multi-threading code to follow Solr conventions, reducing the number of files 
for helper classes, and eventually getting this working correctly in 
distributed mode (was originally built for use cases involving a single Solr 
core as a "representative model"). Would also be good to make a getting started 
tutorial with example data so its easier get started with the feature and do 
something interesting out of the box.

Will continue working on those items as I'm able. Feedback welcome.

> Graph Traversal for Significantly Related Terms (Semantic Knowledge Graph)
> --------------------------------------------------------------------------
>                 Key: SOLR-9480
>                 URL: https://issues.apache.org/jira/browse/SOLR-9480
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Trey Grainger
>         Attachments: SOLR-9480.patch
> This issue is to track the contribution of the Semantic Knowledge Graph Solr 
> Plugin (request handler), which exposes a graph-like interface for 
> discovering and traversing significant relationships between entities within 
> an inverted index.
> This data model has been described in the following research paper: [The 
> Semantic Knowledge Graph: A compact, auto-generated model for real-time 
> traversal and ranking of any relationship within a 
> domain|https://arxiv.org/abs/1609.00464], as well as in presentations I gave 
> in October 2015 at [Lucene/Solr 
> Revolution|http://www.slideshare.net/treygrainger/leveraging-lucenesolr-as-a-knowledge-graph-and-intent-engine]
>  and November 2015 at the [Bay Area Search 
> Meetup|http://www.treygrainger.com/posts/presentations/searching-on-intent-knowledge-graphs-personalization-and-contextual-disambiguation/].
> The source code for this project is currently available at 
> [https://github.com/careerbuilder/semantic-knowledge-graph], and the folks at 
> CareerBuilder (where this was built) have given me the go-ahead to now 
> contribute this back to the Apache Solr Project, as well.
> Check out the Github repository, research paper, or presentations for a more 
> detailed description of this contribution. Initial patch coming soon.

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