Stage 1: Added optimistic concurrency control to _update function #369
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optimisticConcurrencyMode - int, indicates optimistic concurrency strategy from Solr Docs
includeVersionField - bool, tell Solr to return version field after add/update document
Details in https://solr.apache.org/guide/6_6/updating-parts-of-documents.html#UpdatingPartsofDocuments-OptimisticConcurrency
#367