There are irregular exceptions from spell check component. Below is the stack trace. This is not common for all the q terms but have often seen them occurring for specific queries after enabling spellcheck.collate method.
<lst name="error"> <str name="msg">String index out of range: -3</str> <str name="trace"> java.lang.StringIndexOutOfBoundsException: String index out of range: -3 at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:789) at java.lang.StringBuilder.replace(StringBuilder.java:266) at org.apache.solr.spelling.SpellCheckCollator.getCollation(SpellCheckCollator.java:235) at org.apache.solr.spelling.SpellCheckCollator.collate(SpellCheckCollator.java:92) at org.apache.solr.handler.component.SpellCheckComponent.addCollationsToResponse(SpellCheckComponent.java:230) at org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:197) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:226) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135) at org.apache.solr.core.SolrCore.execute(SolrCore.java:1976) at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:777) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:497) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:722) </str> <int name="code">500</int>
