2534895 - How to resolve "status: 414, message:Request-URI Too Long" error

Customer are implementing Hybris Commerce B2B and B2C.  When uploading facets to their system,  getting "Request-URI Too Long" error from Solr system. The  related error log and the request in attachments.
Here's error log snippet.
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 | ERROR [hybrisHTTP19] [SolrSearchRequestResponsePopulator] Exception while executing SOLR search
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 | de.hybris.platform.solrfacetsearch.search.FacetSearchException: Error from server at http://******:8983/solr: non ok status: 414, message:Request-URI Too Long
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.solrfacetsearch.search.impl.LegacyFacetSearchStrategy.search(LegacyFacetSearchStrategy.java:205) ~[solrfacetsearchserver.jar:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.solrfacetsearch.search.impl.DefaultFacetSearchService.search(DefaultFacetSearchService.java:90) ~[solrfacetsearchserver.jar:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.solrfacetsearch.search.impl.DefaultFacetSearchService.search(DefaultFacetSearchService.java:79) ~[solrfacetsearchserver.jar:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.commerceservices.search.solrfacetsearch.populators.SolrSearchRequestResponsePopulator.populate(SolrSearchRequestResponsePopulator.java:71) ~[classes/:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.commerceservices.search.solrfacetsearch.populators.SolrSearchRequestResponsePopulator.populate(SolrSearchRequestResponsePopulator.java:1) ~[classes/:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.converters.impl.AbstractPopulatingConverter.populate(AbstractPopulatingConverter.java:73) ~[classes/:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.946 |  at de.hybris.platform.commerceservices.converter.impl.AbstractPopulatingConverter.convert(AbstractPopulatingConverter.java:37) ~[classes/:?]
.......
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.981 | Caused by: de.hybris.platform.solrfacetsearch.search.FacetSearchException: Error from server at http://****:8983/solr: non ok status: 414, message:Request-URI Too Long
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.981 |  at de.hybris.platform.solrfacetsearch.search.impl.LegacyFacetSearchStrategy.search(LegacyFacetSearchStrategy.java:191) ~[solrfacetsearchserver.jar:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.981 |  ... 158 more
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.981 | Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at http://****:8983/solr: non ok status: 414, message:Request-URI Too Long
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.981 |  at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:525) ~[solr-solrj-6.1.0.jar:6.1.0 4726c5b2d2efa9ba160b608d46a977d0a6b83f94 - jpountz - 2016-06-13 09:46:59]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.982 |  at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:259) ~[solr-solrj-6.1.0.jar:6.1.0 4726c5b2d2efa9ba160b608d46a977d0a6b83f94 - jpountz - 2016-06-13 09:46:59]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.982 |  at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248) ~[solr-solrj-6.1.0.jar:6.1.0 4726c5b2d2efa9ba160b608d46a977d0a6b83f94 - jpountz - 2016-06-13 09:46:59]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.982 |  at org.apache.solr.client.solrj.impl.LBHttpSolrClient.request(LBHttpSolrClient.java:547) ~[solr-solrj-6.1.0.jar:6.1.0 4726c5b2d2efa9ba160b608d46a977d0a6b83f94 - jpountz - 2016-06-13 09:46:59]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.982 |  at de.hybris.platform.solrfacetsearch.solr.impl.CachedSolrClient.request(CachedSolrClient.java:50) ~[solrfacetsearchserver.jar:?]
INFO   | jvm 1    | main    | 2017/09/12 19:46:37.982 |  at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:149) ~[solr-solrj-6.1.0.jar:6.1.0 4726c5b2d2efa9ba160b608d46a977d0a6b83f94 - jpountz - 2016-06-13 09:46:59]

• SAP Hybris Commerce 6.3.0.6
• solr version 5.3.0, in legacy mode

solr, status: 414, message:Request-URI Too Long, facet , KBA , CEC-SCC-COM-SRC-SER , Search and Navigation , How To