From 0e8fc93b7943f9a8ebe4cf3f9b609ea14685ed65 Mon Sep 17 00:00:00 2001 From: Marcin Koziej Date: Thu, 24 Nov 2011 17:08:36 +0100 Subject: [PATCH 1/1] first search demo reusable index. first attempt at rich search query async indexing, fixes multisearch fails to see joined queries -> will try to use one toplevel store contents in index for highlighting fragments aggregate & display results fixed multithreading bug with attaching to jvm log parallel job exceptions don't index tags from db. paralell indexing --- .gitignore | 2 + apps/catalogue/models.py | 13 +- apps/search/__init__.py | 4 +- apps/search/index.py | 387 ++++++++++++++++++- apps/search/urls.py | 10 + apps/search/views.py | 66 ++++ requirements.txt | 3 + wolnelektury/settings.py | 7 +- wolnelektury/templates/newsearch/search.html | 56 +++ wolnelektury/urls.py | 2 + 10 files changed, 530 insertions(+), 20 deletions(-) create mode 100644 apps/search/urls.py create mode 100644 apps/search/views.py create mode 100644 wolnelektury/templates/newsearch/search.html diff --git a/.gitignore b/.gitignore index c37544128..230a87670 100644 --- a/.gitignore +++ b/.gitignore @@ -33,3 +33,5 @@ thumbs.db # Tags file TAGS + +media diff --git a/apps/catalogue/models.py b/apps/catalogue/models.py index 5846f5343..1a2e8f86f 100644 --- a/apps/catalogue/models.py +++ b/apps/catalogue/models.py @@ -626,8 +626,19 @@ class Book(models.Model): return result.wait() def search_index(self): - with search.Index() as idx: + if settings.SEARCH_INDEX_PARALLEL: + if instance(settings.SEARCH_INDEX_PARALLEL, int): + idx = search.ReusableIndex(threads=4) + else: + idx = search.ReusableIndex() + else: + idx = search.Index() + + idx.open() + try: idx.index_book(self) + finally: + idx.close() @classmethod def from_xml_file(cls, xml_file, **kwargs): diff --git a/apps/search/__init__.py b/apps/search/__init__.py index f45c150f1..a3f8e9ec0 100644 --- a/apps/search/__init__.py +++ b/apps/search/__init__.py @@ -1,3 +1,3 @@ -from index import Index, Search import lucene -lucene.initVM(lucene.CLASSPATH) + +from index import Index, Search, ReusableIndex, MultiSearch, SearchResult, JVM diff --git a/apps/search/index.py b/apps/search/index.py index 050fc5b49..af3dd9a60 100644 --- a/apps/search/index.py +++ b/apps/search/index.py @@ -1,18 +1,29 @@ # -*- coding: utf-8 -*- + from django.conf import settings from lucene import SimpleFSDirectory, IndexWriter, File, Field, \ NumericField, Version, Document, JavaError, IndexSearcher, \ - QueryParser, Term, PerFieldAnalyzerWrapper, \ + QueryParser, PerFieldAnalyzerWrapper, \ SimpleAnalyzer, PolishAnalyzer, ArrayList, \ KeywordAnalyzer, NumericRangeQuery, BooleanQuery, \ BlockJoinQuery, BlockJoinCollector, TermsFilter, \ - HashSet, BooleanClause, Term + HashSet, BooleanClause, Term, CharTermAttribute, \ + PhraseQuery, MultiPhraseQuery, StringReader, TermQuery, BlockJoinQuery, \ + FuzzyQuery, FuzzyTermEnum, Sort, Integer, \ + SimpleHTMLFormatter, Highlighter, QueryScorer, TokenSources, TextFragment, \ + initVM, CLASSPATH, JArray # KeywordAnalyzer +JVM = initVM(CLASSPATH) +import sys import os import errno from librarian import dcparser from librarian.parser import WLDocument import catalogue.models +from multiprocessing.pool import ThreadPool +from threading import current_thread +import atexit +import traceback class WLAnalyzer(PerFieldAnalyzerWrapper): @@ -34,7 +45,9 @@ class WLAnalyzer(PerFieldAnalyzerWrapper): self.addAnalyzer("author", simple) self.addAnalyzer("is_book", keyword) - #self.addanalyzer("fragment_anchor", keyword) + self.addAnalyzer("KEYWORD", keyword) + self.addAnalyzer("SIMPLE", simple) + self.addAnalyzer("NATURAL", polish) class IndexStore(object): @@ -72,7 +85,7 @@ class Index(IndexStore): self.index = None def remove_book(self, book): - q = NumericRangeQuery.newIntRange("book_id", book.id, book.id, True,True) + q = NumericRangeQuery.newIntRange("book_id", book.id, book.id, True, True) self.index.deleteDocuments(q) def index_book(self, book, overwrite=True): @@ -97,6 +110,8 @@ class Index(IndexStore): 'wywiad' ] + skip_header_tags = ['autor_utworu', 'nazwa_utworu', 'dzielo_nadrzedne'] + def create_book_doc(self, book): """ Create a lucene document connected to the book @@ -110,6 +125,8 @@ class Index(IndexStore): def extract_metadata(self, book): book_info = dcparser.parse(book.xml_file) + print("extract metadata for book %s id=%d, thread%d" % (book.slug, book.id, current_thread().ident)) + doc = self.create_book_doc(book) doc.add(Field("slug", book.slug, Field.Store.NO, Field.Index.ANALYZED_NO_NORMS)) doc.add(Field("tags", ','.join([t.name for t in book.tags]), Field.Store.NO, Field.Index.ANALYZED)) @@ -158,14 +175,16 @@ class Index(IndexStore): master = self.get_master(root) if master is None: return [] - + header_docs = [] for header, position in zip(list(master), range(len(master))): + if header.tag in self.skip_header_tags: + continue doc = self.create_book_doc(book) doc.add(NumericField("header_index", Field.Store.YES, True).setIntValue(position)) doc.add(Field("header_type", header.tag, Field.Store.YES, Field.Index.NOT_ANALYZED)) content = u' '.join([t for t in header.itertext()]) - doc.add(Field("content", content, Field.Store.NO, Field.Index.ANALYZED)) + doc.add(Field("content", content, Field.Store.YES, Field.Index.ANALYZED)) header_docs.append(doc) def walker(node): @@ -202,16 +221,13 @@ class Index(IndexStore): return u' '.join(map( lambda x: x == None and u'(none)' or unicode(x), l)) - s = u"Fragment %s complete, themes: %s contents: %s" % \ - (fid, jstr(frag['themes']), jstr(frag['content'])) - print(s.encode('utf-8')) doc = self.create_book_doc(book) doc.add(Field("fragment_anchor", fid, Field.Store.YES, Field.Index.NOT_ANALYZED)) doc.add(Field("content", u' '.join(filter(lambda s: s is not None, frag['content'])), - Field.Store.NO, Field.Index.ANALYZED)) + Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS)) doc.add(Field("themes", u' '.join(filter(lambda s: s is not None, frag['themes'])), Field.Store.NO, Field.Index.ANALYZED)) @@ -234,10 +250,67 @@ class Index(IndexStore): self.close() +def log_exception_wrapper(f): + def _wrap(*a): + try: + f(*a) + except Exception, e: + print("Error in indexing thread: %s" % e) + traceback.print_exc() + raise e + return _wrap + + +class ReusableIndex(Index): + """ + Works like index, but does not close/optimize Lucene index + until program exit (uses atexit hook). + This is usefull for importbooks command. + + if you cannot rely on atexit, use ReusableIndex.close_reusable() yourself. + """ + index = None + pool = None + pool_jobs = None + + def open(self, analyzer=None, threads=4): + if ReusableIndex.index is not None: + self.index = ReusableIndex.index + else: + print("opening index") + ReusableIndex.pool = ThreadPool(threads, initializer=lambda: JVM.attachCurrentThread() ) + ReusableIndex.pool_jobs = [] + Index.open(self, analyzer) + ReusableIndex.index = self.index + atexit.register(ReusableIndex.close_reusable) + + def index_book(self, *args, **kw): + job = ReusableIndex.pool.apply_async(log_exception_wrapper(Index.index_book), (self,) + args, kw) + ReusableIndex.pool_jobs.append(job) + + @staticmethod + def close_reusable(): + if ReusableIndex.index is not None: + print("wait for indexing to finish") + for job in ReusableIndex.pool_jobs: + job.get() + sys.stdout.write('.') + sys.stdout.flush() + print("done.") + ReusableIndex.pool.close() + + ReusableIndex.index.optimize() + ReusableIndex.index.close() + ReusableIndex.index = None + + def close(self): + pass + + class Search(IndexStore): def __init__(self, default_field="content"): IndexStore.__init__(self) - self.analyzer = PolishAnalyzer(Version.LUCENE_34) + self.analyzer = WLAnalyzer() #PolishAnalyzer(Version.LUCENE_34) ## self.analyzer = WLAnalyzer() self.searcher = IndexSearcher(self.store, True) self.parser = QueryParser(Version.LUCENE_34, default_field, @@ -296,9 +369,7 @@ class Search(IndexStore): def bsearch(self, query, max_results=50): q = self.query(query) - f = TermsFilter() - f.addTerm(Term("is_book", "true")) - bjq = BlockJoinQuery(q, f, BlockJoinQuery.ScoreMode.Avg) + bjq = BlockJoinQuery(q, self.parent_filter, BlockJoinQuery.ScoreMode.Avg) tops = self.searcher.search(bjq, max_results) bks = [] @@ -306,3 +377,291 @@ class Search(IndexStore): doc = self.searcher.doc(found.doc) bks.append(catalogue.models.Book.objects.get(id=doc.get("book_id"))) return (bks, tops.totalHits) + +# TokenStream tokenStream = analyzer.tokenStream(fieldName, reader); +# OffsetAttribute offsetAttribute = tokenStream.getAttribute(OffsetAttribute.class); +# CharTermAttribute charTermAttribute = tokenStream.getAttribute(CharTermAttribute.class); + +# while (tokenStream.incrementToken()) { +# int startOffset = offsetAttribute.startOffset(); +# int endOffset = offsetAttribute.endOffset(); +# String term = charTermAttribute.toString(); +# } + + +class SearchResult(object): + def __init__(self, searcher, scoreDocs, score=None, highlight_query=None): + if score: + self.score = score + else: + self.score = scoreDocs.score + + self.fragments = [] + self.scores = {} + self.sections = [] + + stored = searcher.doc(scoreDocs.doc) + self.book_id = int(stored.get("book_id")) + + fragment = stored.get("fragment_anchor") + if fragment: + self.fragments.append(fragment) + self.scores[fragment] = scoreDocs.score + + header_type = stored.get("header_type") + if header_type: + sec = (header_type, int(stored.get("header_index"))) + self.sections.append(sec) + self.scores[sec] = scoreDocs.score + + self.snippets = [] + + def add_snippets(self, snippets): + self.snippets += snippets + return self + + def get_book(self): + return catalogue.models.Book.objects.get(id=self.book_id) + + book = property(get_book) + + def get_parts(self): + book = self.book + parts = [{"header": s[0], "position": s[1], '_score_key': s} for s in self.sections] \ + + [{"fragment": book.fragments.get(anchor=f), '_score_key':f} for f in self.fragments] + + parts.sort(lambda a, b: cmp(self.scores[a['_score_key']], self.scores[b['_score_key']])) + print("bookid: %d parts: %s" % (self.book_id, parts)) + return parts + + parts = property(get_parts) + + def merge(self, other): + if self.book_id != other.book_id: + raise ValueError("this search result is or book %d; tried to merge with %d" % (self.book_id, other.book_id)) + self.fragments += other.fragments + self.sections += other.sections + self.snippets += other.snippets + self.scores.update(other.scores) + if other.score > self.score: + self.score = other.score + return self + + def __unicode__(self): + return u'SearchResult(book_id=%d, score=%d)' % (self.book_id, self.score) + + @staticmethod + def aggregate(*result_lists): + books = {} + for rl in result_lists: + for r in rl: + if r.book_id in books: + books[r.book_id].merge(r) + #print(u"already have one with score %f, and this one has score %f" % (books[book.id][0], found.score)) + else: + books[r.book_id] = r + return books.values() + + def __cmp__(self, other): + return cmp(self.score, other.score) + + +class MultiSearch(Search): + """Class capable of IMDb-like searching""" + def get_tokens(self, searched, field='content'): + """returns tokens analyzed by a proper (for a field) analyzer + argument can be: StringReader, string/unicode, or tokens. In the last case + they will just be returned (so we can reuse tokens, if we don't change the analyzer) + """ + if isinstance(searched, str) or isinstance(searched, unicode): + searched = StringReader(searched) + elif isinstance(searched, list): + return searched + + searched.reset() + tokens = self.analyzer.reusableTokenStream(field, searched) + toks = [] + while tokens.incrementToken(): + cta = tokens.getAttribute(CharTermAttribute.class_) + toks.append(cta.toString()) + return toks + + def fuzziness(self, fuzzy): + if not fuzzy: + return None + if isinstance(fuzzy, float) and fuzzy > 0.0 and fuzzy <= 1.0: + return fuzzy + else: + return 0.5 + + def make_phrase(self, tokens, field='content', slop=2, fuzzy=False): + if fuzzy: + phrase = MultiPhraseQuery() + for t in tokens: + term = Term(field, t) + fuzzterm = FuzzyTermEnum(self.searcher.getIndexReader(), term, self.fuzziness(fuzzy)) + fuzzterms = [] + + while True: + # print("fuzz %s" % unicode(fuzzterm.term()).encode('utf-8')) + ft = fuzzterm.term() + if ft: + fuzzterms.append(ft) + if not fuzzterm.next(): break + if fuzzterms: + phrase.add(JArray('object')(fuzzterms, Term)) + else: + phrase.add(term) + else: + phrase = PhraseQuery() + phrase.setSlop(slop) + for t in tokens: + term = Term(field, t) + phrase.add(term) + return phrase + + def make_term_query(self, tokens, field='content', modal=BooleanClause.Occur.SHOULD, fuzzy=False): + q = BooleanQuery() + for t in tokens: + term = Term(field, t) + if fuzzy: + term = FuzzyQuery(term, self.fuzziness(fuzzy)) + else: + term = TermQuery(term) + q.add(BooleanClause(term, modal)) + return q + + def content_query(self, query): + return BlockJoinQuery(query, self.parent_filter, + BlockJoinQuery.ScoreMode.Total) + + def search_perfect_book(self, searched, max_results=20, fuzzy=False): + qrys = [self.make_phrase(self.get_tokens(searched, field=fld), field=fld, fuzzy=fuzzy) for fld in ['author', 'title']] + + books = [] + for q in qrys: + top = self.searcher.search(q, max_results) + for found in top.scoreDocs: + books.append(SearchResult(self.searcher, found)) + return books + + def search_perfect_parts(self, searched, max_results=20, fuzzy=False): + qrys = [self.make_phrase(self.get_tokens(searched), field=fld, fuzzy=fuzzy) for fld in ['content']] + + books = [] + for q in qrys: + top = self.searcher.search(q, max_results) + for found in top.scoreDocs: + books.append(SearchResult(self.searcher, found).add_snippets(self.get_snippets(found, q))) + + return books + + def search_everywhere(self, searched, max_results=20, fuzzy=False): + books = [] + + # content only query : themes x content + q = BooleanQuery() + + tokens = self.get_tokens(searched) + q.add(BooleanClause(self.make_term_query(tokens, field='themes', fuzzy=fuzzy), BooleanClause.Occur.MUST)) + q.add(BooleanClause(self.make_term_query(tokens, field='content', fuzzy=fuzzy), BooleanClause.Occur.SHOULD)) + + topDocs = self.searcher.search(q, max_results) + for found in topDocs.scoreDocs: + books.append(SearchResult(self.searcher, found)) + + # joined query themes/content x author/title/epochs/genres/kinds + q = BooleanQuery() + in_meta = BooleanQuery() + in_content = BooleanQuery() + + for fld in ['themes', 'content']: + in_content.add(BooleanClause(self.make_term_query(tokens, field=fld, fuzzy=False), BooleanClause.Occur.SHOULD)) + + in_meta.add(BooleanClause(self.make_term_query(self.get_tokens(searched, field='author'), field='author', fuzzy=fuzzy), BooleanClause.Occur.SHOULD)) + + for fld in ['title', 'epochs', 'genres', 'kinds']: + in_meta.add(BooleanClause(self.make_term_query(tokens, field=fld, fuzzy=fuzzy), BooleanClause.Occur.SHOULD)) + + q.add(BooleanClause(in_meta, BooleanClause.Occur.MUST)) + in_content_join = self.content_query(in_content) + q.add(BooleanClause(in_content_join, BooleanClause.Occur.MUST)) + # import pdb; pdb.set_trace() + collector = BlockJoinCollector(Sort.RELEVANCE, 100, True, True) + + self.searcher.search(q, collector) + + top_groups = collector.getTopGroups(in_content_join, Sort.RELEVANCE, 0, max_results, 0, True) + if top_groups: + for grp in top_groups.groups: + for part in grp.scoreDocs: + books.append(SearchResult(self.searcher, part, score=grp.maxScore)) + return books + + def multisearch(self, query, max_results=50): + """ + Search strategy: + - (phrase) OR -> content + -> title + -> author + - (keywords) -> author + -> motyw + -> tags + -> content + """ + # queryreader = StringReader(query) + # tokens = self.get_tokens(queryreader) + + # top_level = BooleanQuery() + # Should = BooleanClause.Occur.SHOULD + + # phrase_level = BooleanQuery() + # phrase_level.setBoost(1.3) + + # p_content = self.make_phrase(tokens, joined=True) + # p_title = self.make_phrase(tokens, 'title') + # p_author = self.make_phrase(tokens, 'author') + + # phrase_level.add(BooleanClause(p_content, Should)) + # phrase_level.add(BooleanClause(p_title, Should)) + # phrase_level.add(BooleanClause(p_author, Should)) + + # kw_level = BooleanQuery() + + # kw_level.add(self.make_term_query(tokens, 'author'), Should) + # j_themes = self.make_term_query(tokens, 'themes', joined=True) + # kw_level.add(j_themes, Should) + # kw_level.add(self.make_term_query(tokens, 'tags'), Should) + # j_con = self.make_term_query(tokens, joined=True) + # kw_level.add(j_con, Should) + + # top_level.add(BooleanClause(phrase_level, Should)) + # top_level.add(BooleanClause(kw_level, Should)) + + return None + + + def do_search(self, query, max_results=50, collector=None): + tops = self.searcher.search(query, max_results) + #tops = self.searcher.search(p_content, max_results) + + bks = [] + for found in tops.scoreDocs: + doc = self.searcher.doc(found.doc) + b = catalogue.models.Book.objects.get(id=doc.get("book_id")) + bks.append(b) + print "%s (%d) -> %f" % (b, b.id, found.score) + return (bks, tops.totalHits) + + def get_snippets(self, scoreDoc, query, field='content'): + htmlFormatter = SimpleHTMLFormatter() + highlighter = Highlighter(htmlFormatter, QueryScorer(query)) + + stored = self.searcher.doc(scoreDoc.doc) + text = stored.get(field) + tokenStream = TokenSources.getAnyTokenStream(self.searcher.getIndexReader(), scoreDoc.doc, field, self.analyzer) + # highlighter.getBestTextFragments(tokenStream, text, False, 10) + snip = highlighter.getBestFragments(tokenStream, text, 3, "...") + print('snips: %s' % snip) + + return [snip] diff --git a/apps/search/urls.py b/apps/search/urls.py new file mode 100644 index 000000000..f93d65e79 --- /dev/null +++ b/apps/search/urls.py @@ -0,0 +1,10 @@ +# -*- coding: utf-8 -*- +# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later. +# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information. +# +from django.conf.urls.defaults import * + +urlpatterns = patterns('search.views', + url(r'^$', 'main', name='newsearch'), +) + diff --git a/apps/search/views.py b/apps/search/views.py new file mode 100644 index 000000000..d9b2f26d5 --- /dev/null +++ b/apps/search/views.py @@ -0,0 +1,66 @@ + +from django.shortcuts import render_to_response, get_object_or_404 +from django.template import RequestContext +from django.contrib.auth.decorators import login_required +from django.views.decorators import cache + +from catalogue.utils import get_random_hash +from catalogue.models import Book, Tag +from catalogue import forms +from search import MultiSearch, JVM, SearchResult +from lucene import StringReader + +import enchant + +dictionary = enchant.Dict('pl_PL') + + +def did_you_mean(query, tokens): + change = {} + + for t in tokens: + print("%s ok? %s, sug: %s" %(t, dictionary.check(t), dictionary.suggest(t))) + if not dictionary.check(t): + try: + change[t] = dictionary.suggest(t)[0] + except IndexError: + pass + + if change == {}: + return None + + for frm, to in change.items(): + query = query.replace(frm, to) + + return query + + +def main(request): + results = {} + JVM.attachCurrentThread() # where to put this? + srch = MultiSearch() + + results = None + query = None + fuzzy = False + if 'q' in request.GET: + query = request.GET['q'] + toks = StringReader(query) + fuzzy = 'fuzzy' in request.GET + if fuzzy: + fuzzy = 0.7 + + + results = SearchResult.aggregate(srch.search_perfect_book(toks, fuzzy=fuzzy), + srch.search_perfect_parts(toks, fuzzy=fuzzy), + srch.search_everywhere(toks, fuzzy=fuzzy)) + results.sort(reverse=True) + + for r in results: + print r.parts + + return render_to_response('newsearch/search.html', {'results': results, + 'did_you_mean': (query is not None) and + did_you_mean(query, srch.get_tokens(query, field='SIMPLE')), + 'fuzzy': fuzzy}, + context_instance=RequestContext(request)) diff --git a/requirements.txt b/requirements.txt index 4fd263ef3..dfb01f19d 100644 --- a/requirements.txt +++ b/requirements.txt @@ -28,3 +28,6 @@ lxml>=2.2.2 # celery tasks django-celery django-kombu + +# spell checking +pyenchant diff --git a/wolnelektury/settings.py b/wolnelektury/settings.py index 757447e71..ca0678455 100644 --- a/wolnelektury/settings.py +++ b/wolnelektury/settings.py @@ -229,11 +229,12 @@ API_WAIT = 10 # limit number of filtering tags MAX_TAG_LIST = 6 -NO_BUILD_EPUB = False +NO_BUILD_EPUB = True NO_BUILD_TXT = False -NO_BUILD_PDF = False -NO_BUILD_MOBI = False +NO_BUILD_PDF = True +NO_BUILD_MOBI = True NO_SEARCH_INDEX = False +SEARCH_INDEX_PARALLEL = False ALL_EPUB_ZIP = 'wolnelektury_pl_epub' ALL_PDF_ZIP = 'wolnelektury_pl_pdf' diff --git a/wolnelektury/templates/newsearch/search.html b/wolnelektury/templates/newsearch/search.html new file mode 100644 index 000000000..af36b5988 --- /dev/null +++ b/wolnelektury/templates/newsearch/search.html @@ -0,0 +1,56 @@ +{% extends "base.html" %} +{% load i18n %} +{% load catalogue_tags %} + +{% block title %}Search{% endblock %} + +{% block metadescription %}{% endblock %} + +{% block bodyid %}newsearch{% endblock %} + +{% block body %} +

Search

+
+

+ + +
+ fuzzy. +

+
+ {% if did_you_mean %} + Czy miałeś na mysli {{did_you_mean}}? + {% endif %} + + +
+
    + {% for result in results %} +
  1. +

    {{result.book.pretty_title}} (id: {{result.book.id}}, score: {{result.score}})

    +
      + {% for snippet in result.snippets %} +
    • {{snippet|safe}}
      • + {% endfor %} + + {% for part in result.parts %} + {% if part.header %} +
    • W {{part.header}} nr {{part.position}}
      • + {% else %} + {% if part.fragment %} +
    • +
      Tagi/Motywy: {% for tag in part.fragment.tags %}{{tag.name}} {% endfor %}
      + {{part.fragment.short_html|safe}} +
      • + {% endif %} + {% endif %} + {% endfor %} +
    +
    2. + {% empty %} +

    No results.

    + {% endfor %} +
+
+ +{% endblock %} diff --git a/wolnelektury/urls.py b/wolnelektury/urls.py index f379c9ca1..2a199c7c0 100644 --- a/wolnelektury/urls.py +++ b/wolnelektury/urls.py @@ -40,6 +40,8 @@ urlpatterns = patterns('', # API (r'^api/', include('api.urls')), + url(r'^newsearch/', include('search.urls')), + # Static files url(r'^%s(?P.*)$' % settings.MEDIA_URL[1:], 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT, 'show_indexes': True}), -- 2.20.1