merge from 2.2 branch: remove the index queue item when it is being processed. https://projects.ecoinformatics.org/ecoinfo/issues/6117
remove any index event errors if the pid has successfully been reindexed. https://projects.ecoinformatics.org/ecoinfo/issues/6089
Change the parameters order of the constructor. We maybe reuse some code from d1_cn_processor.
Modified the documentation.
Use the ResourceMapException when a component of a resource map isn't found in the solr index.
Add a ResourceMapException.
Use the class path configuration of spring to replace the file configuration. We can reuse the application context files in the d1_cn_index_processor jar.
Add a constructor.
Remove the constructor.
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