diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index c5cba60..ba4cedb 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/cloud-container-engine'
 otcdocs_git_fqdn = 'gitea.eco.tsi-dev.otc-service.com'
 otcdocs_git_type = 'gitea'
 
+# Those variables are needed for indexing into OpenSearch
+otcdocs_doc_environment = 'internal'
+otcdocs_doc_link = '/cloud-container-engine/api-ref/'
+otcdocs_doc_title = 'API Reference'
+otcdocs_doc_type = 'api-ref'
+otcdocs_service_category = 'container'
+otcdocs_service_title = 'Cloud Container Engine'
+otcdocs_service_type = 'cce'
+otcdocs_search_environment = 'hc_de'
+otcdocs_search_url = "https://opensearch.eco.tsi-dev.otc-service.com/"
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
diff --git a/tox.ini b/tox.ini
index b7d7469..06e5284 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,9 @@ commands = {posargs}
 # This env is invoked in the periodic pipeline and is therefore responsible to
 # build all relevant docs at once.
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+  -r{toxinidir}/doc/requirements.txt
+  -c https://raw.githubusercontent.com/opentelekomcloud-docs/docs-constraints/main/constraints.txt
 allowlist_externals =
   mkdir
   cp
@@ -34,13 +36,13 @@ allowlist_externals =
 commands =
   rm -rf doc/build/html doc/build/doctrees
   sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
-  {[testenv:api-ref]commands}
-  {[testenv:json-api-ref]commands}
   {[testenv:umn]commands}
   {[testenv:json-umn]commands}
+  {[testenv:api-ref]commands}
+  {[testenv:json-api-ref]commands}
 
 [testenv:docs-pdf]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -52,9 +54,37 @@ commands =
   {[testenv:api-ref-pdf-docs]commands}
 
 
+# HTML version
+[testenv:umn]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+commands =
+  sphinx-build -W --keep-going -b html umn/source doc/build/html/umn
+  mkdir -p umn/build/html
+  cp -av doc/build/html/umn umn/build/html
+
+# Json version (for search)
+[testenv:json-umn]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+  sh
+commands =
+  sphinx-build -W --keep-going -b json umn/source doc/build/json/umn
+  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
+  # in tox
+  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
+  mkdir -p umn/build/json
+  cp -av doc/build/json/umn umn/build/json
+
+
+
 # HTML version
 [testenv:api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -65,7 +95,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -80,7 +110,7 @@ commands =
 
 # PDF version
 [testenv:api-ref-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -97,34 +127,6 @@ commands =
   cp api-ref/build/pdf/cce-api-ref.pdf doc/build/pdf/
 
 
-# HTML version
-[testenv:umn]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-commands =
-  sphinx-build -W --keep-going -b html umn/source doc/build/html/umn
-  mkdir -p umn/build/html
-  cp -av doc/build/html/umn umn/build/html
-
-# Json version (for search)
-[testenv:json-umn]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-  sh
-commands =
-  sphinx-build -W --keep-going -b json umn/source doc/build/json/umn
-  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
-  # in tox
-  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
-  mkdir -p umn/build/json
-  cp -av doc/build/json/umn umn/build/json
-
-
-
 
 [doc8]
 ignore = D001
diff --git a/umn/source/conf.py b/umn/source/conf.py
index cba9a5d..4bcf330 100644
--- a/umn/source/conf.py
+++ b/umn/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/cloud-container-engine'
 otcdocs_git_fqdn = 'gitea.eco.tsi-dev.otc-service.com'
 otcdocs_git_type = 'gitea'
 
+# Those variables are needed for indexing into OpenSearch
+otcdocs_doc_environment = 'internal'
+otcdocs_doc_link = '/cloud-container-engine/umn/'
+otcdocs_doc_title = 'User Guide'
+otcdocs_doc_type = 'umn'
+otcdocs_service_category = 'container'
+otcdocs_service_title = 'Cloud Container Engine'
+otcdocs_service_type = 'cce'
+otcdocs_search_environment = 'hc_de'
+otcdocs_search_url = "https://opensearch.eco.tsi-dev.otc-service.com/"
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -98,9 +109,4 @@ html_static_path = ['_static']
 html_copy_source = False
 
 # -- Options for PDF output --------------------------------------------------
-latex_documents = [
-    ('index',
-     'None.tex',
-     u'Cloud Container Engine - User Guide',
-     u'OpenTelekomCloud', 'manual'),
-]
+latex_documents = []