Need to change default audit retentions in Solr 3 months and do some performance tuning

Currently, the default TTL is 3 years, which is too much. This will require a much bigger SolrCloud and it might be necessary because, it is recommended that long time archival should be in HDFS.

Also, need to do change the field types for date to use "docValues". This is recommended by Solr community if the fields are used for sorting.

Another change need to be done is to the setting for useColdSearcher. The default is "false", which will make the search to block if the searcher is still warming up. If the index is very big, it might take a very long time for the searcher to be fully warmed up.