要解决Apache NiFi QuerySolr处理器达到"start"参数上限的问题，可以使用分页查询来处理大量数据。下面是一个示例代码：

import org.apache.nifi.processor.AbstractProcessor;
import org.apache.nifi.processor.ProcessContext;
import org.apache.nifi.processor.ProcessSession;
import org.apache.nifi.processor.ProcessSessionFactory;
import org.apache.nifi.processor.Relationship;
import org.apache.nifi.processor.exception.ProcessException;
import org.apache.nifi.processor.io.InputStreamCallback;
import org.apache.nifi.processor.io.OutputStreamCallback;
import org.apache.nifi.processor.util.StandardValidators;
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrQuery.ORDER;
import org.apache.solr.client.solrj.SolrResponse;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class QuerySolrProcessor extends AbstractProcessor {

    public static final Relationship SUCCESS = new Relationship.Builder()
            .name("success")
            .description("Success relationship")
            .build();

    public static final Relationship FAILURE = new Relationship.Builder()
            .name("failure")
            .description("Failure relationship")
            .build();

    public static final PropertyDescriptor SOLR_URL = new PropertyDescriptor
            .Builder().name("Solr URL")
            .description("URL of the Solr server")
            .required(true)
            .addValidator(StandardValidators.URL_VALIDATOR)
            .build();

    public static final PropertyDescriptor QUERY = new PropertyDescriptor
            .Builder().name("Query")
            .description("Solr query string")
            .required(true)
            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
            .build();

    public static final PropertyDescriptor PAGE_SIZE = new PropertyDescriptor
            .Builder().name("Page Size")
            .description("Number of documents to retrieve per page")
            .required(true)
            .defaultValue("1000")
            .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
            .build();

    public static final PropertyDescriptor MAX_RESULTS = new PropertyDescriptor
            .Builder().name("Max Results")
            .description("Maximum number of documents to retrieve")
            .required(true)
            .defaultValue("10000")
            .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
            .build();

    public static final PropertyDescriptor OUTPUT_FIELD = new PropertyDescriptor
            .Builder().name("Output Field")
            .description("Name of the field in the Solr documents to output")
            .required(true)
            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
            .build();

    private List descriptors;

    private Set relationships;

    public QuerySolrProcessor() {
        List descriptors = new ArrayList<>();
        descriptors.add(SOLR_URL);
        descriptors.add(QUERY);
        descriptors.add(PAGE_SIZE);
        descriptors.add(MAX_RESULTS);
        descriptors.add(OUTPUT_FIELD);
        this.descriptors = Collections.unmodifiableList(descriptors);

        Set relationships = new HashSet<>();
        relationships.add(SUCCESS);
        relationships.add(FAILURE);
        this.relationships = Collections.unmodifiableSet(relationships);
    }

    @Override
    public Set getRelationships() {
        return relationships;
    }

    @Override
    public final List getSupportedPropertyDescriptors() {
        return descriptors;
    }

    @Override
    public void onTrigger(ProcessContext context, ProcessSessionFactory sessionFactory) throws ProcessException {
        final ProcessSession session = sessionFactory.createSession();
        final String solrUrl = context.getProperty(SOLR_URL).getValue();
        final String query = context.getProperty(QUERY).getValue();
        final int pageSize = context.getProperty(PAGE_SIZE).asInteger();
        final int maxResults = context.getProperty(MAX_RESULTS).asInteger();
        final String outputField = context.getProperty(OUTPUT_FIELD).getValue();

        try {
            SolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();

            int start = 0;
            int retrievedResults = 0;

            while (retrievedResults < maxResults) {
                SolrQuery solrQuery = new SolrQuery(query);
                solrQuery.setStart(start);
                solrQuery.setRows(pageSize);
                solrQuery.setSort(outputField