我在Oracle DB中有一个表，该表具有filePath和fileName。但是实际文件在文件服务器中可用。我的目标是也索引那些文件（pdf）。
因此，首先，我使用logstash为我的oracle表建立了索引，并将索引命名为document。
document索引具有以下字段：
id
app_language
filePath
fileName
使用Java代码正在查询document索引以获取filePath和fileName。然后，通过使用filePath + fileName并读取实际文件，然后将文件编码为base64。之后，创建另一个名为document_attachment的索引，并通过Java代码使用ingest-attachment processor添加编码的fileContent。
我新创建的索引document_attachment具有以下字段：
id
app_language
filePath
fileName
fileContents
实际上，两个索引几乎相同。第二个索引的唯一区别是，将所有从第一索引的字段复制到第二索引并附加fileContents（fileContents是第二个索引中唯一添加的额外字段）。
我正在用Java进行这项活动。
Step 1 : am querying `document` index (which is having file path). It having more than `100k` documents.
因此，对于此查询活动，我设置了"max_result_window": "150000",并还使用了scrollAPI。
我设置了searchSourceBuilder.size(50000);，因此只能提取50k个文档。如果我增加此大小，searchSourceBuilder.size(100000);就会在下面的行中得到NullPointerException。
SearchHit[] searchHits = searchResponse.getHits().getHits();
请在下面找到我的错误。
D:\Karthikeyan\ElasticSearch\ElasticSearch_Tesing\target>java -jar ElasticSearch
Utility-1.0.0-SNAPSHOT-jar-with-dependencies.jar
Jul 13, 2018 12:09:34 PM com.es.utility.DocumentIndex main
INFO: Started Indexing the Document.....
ERROR StatusLogger No log4j2 configuration file found. Using default configurati
on: logging only errors to the console. Set system property 'log4j2.debug' to sh
ow Log4j2 internal initialization logging.
Exception in thread "main" java.lang.NullPointerException
at com.es.utility.DocumentIndex.main(DocumentIndex.java:82)
请使用scrollAPI查找下面的Java代码：
public class DocumentIndex {
private final static String INDEX = "documents";
private final static String ATTACHMENT = "document_attachment";
private final static String TYPE = "doc";
private static final Logger logger = Logger.getLogger(Thread.currentThread().getStackTrace()[0].getClassName());
public static void main(String args[]) throws IOException {
RestHighLevelClient restHighLevelClient = null;
Document doc=new Document();
logger.info("Started Indexing the Document.....");
try {
restHighLevelClient = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http"),
new HttpHost("localhost", 9201, "http")));
} catch (Exception e) {
System.out.println(e.getMessage());
}
//Fetching Id, FilePath & FileName from Document Index.
SearchRequest searchRequest = new SearchRequest(INDEX);
searchRequest.types(TYPE);
final Scroll scroll = new Scroll(TimeValue.timeValueMinutes(1L)); //part of Scroll API
searchRequest.scroll(scroll); //part of Scroll API
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
QueryBuilder qb = QueryBuilders.matchAllQuery();
searchSourceBuilder.query(qb);
searchSourceBuilder.size(50000);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = null;
try {
searchResponse = restHighLevelClient.search(searchRequest);
} catch (IOException e) {
e.getLocalizedMessage();
}
String scrollId = searchResponse.getScrollId(); //part of Scroll API
SearchHit[] searchHits = searchResponse.getHits().getHits();
long totalHits=searchResponse.getHits().totalHits;
logger.info("Total Hits --->"+totalHits);
//part of Scroll API -- Starts
while (searchHits != null && searchHits.length > 0) {
SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
scrollRequest.scroll(scroll);
searchResponse = restHighLevelClient.search(searchRequest);
scrollId = searchResponse.getScrollId();
searchHits = searchResponse.getHits().getHits();
File all_files_path = new File("d:\\All_Files_Path.txt");
File available_files = new File("d:\\Available_Files.txt");
File missing_files = new File("d:\\Missing_Files.txt");
int totalFilePath=1;
int totalAvailableFile=1;
int missingFilecount=1;
Map<String, Object> jsonMap ;
for (SearchHit hit : searchHits) {
String encodedfile = null;
File file=null;
Map<String, Object> sourceAsMap = hit.getSourceAsMap();
if(sourceAsMap != null) {
doc.setId((int) sourceAsMap.get("id"));
doc.setApp_language(String.valueOf(sourceAsMap.get("app_language")));
}
String filepath=doc.getPath().concat(doc.getFilename());
logger.info("ID---> "+doc.getId()+"File Path --->"+filepath);
try(PrintWriter out = new PrintWriter(new FileOutputStream(all_files_path, true)) ){
out.println("FilePath Count ---"+totalFilePath+":::::::ID---> "+doc.getId()+"File Path --->"+filepath);
}
file = new File(filepath);
if(file.exists() && !file.isDirectory()) {
try {
try(PrintWriter out = new PrintWriter(new FileOutputStream(available_files, true)) ){
out.println("Available File Count --->"+totalAvailableFile+":::::::ID---> "+doc.getId()+"File Path --->"+filepath);
totalAvailableFile++;
}
FileInputStream fileInputStreamReader = new FileInputStream(file);
byte[] bytes = new byte[(int) file.length()];
fileInputStreamReader.read(bytes);
encodedfile = new String(Base64.getEncoder().encodeToString(bytes));
fileInputStreamReader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
else
{
System.out.println("Else block");
PrintWriter out = new PrintWriter(new FileOutputStream(missing_files, true));
out.println("Available File Count --->"+missingFilecount+":::::::ID---> "+doc.getId()+"File Path --->"+filepath);
out.close();
missingFilecount++;
}
jsonMap = new HashMap<>();
jsonMap.put("id", doc.getId());
jsonMap.put("app_language", doc.getApp_language());
jsonMap.put("fileContent", encodedfile);
String id=Long.toString(doc.getId());
IndexRequest request = new IndexRequest(ATTACHMENT, "doc", id )
.source(jsonMap)
.setPipeline(ATTACHMENT);
PrintStream printStream = new PrintStream(new File("d:\\exception.txt"));
try {
IndexResponse response = restHighLevelClient.index(request);
} catch(ElasticsearchException e) {
if (e.status() == RestStatus.CONFLICT) {
}
e.printStackTrace(printStream);
}
totalFilePath++;
}
}
ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
clearScrollRequest.addScrollId(scrollId);
ClearScrollResponse clearScrollResponse = restHighLevelClient.clearScroll(clearScrollRequest);
boolean succeeded = clearScrollResponse.isSucceeded();
////part of Scroll API -- Ends
logger.info("Indexing done.....");
}
}