11[role="xpack"]
22[testenv="platinum"]
33[[ccr-overview]]
4- == Overview
4+ === Overview
55
66
77{ccr-cap} is done on an index-by-index basis. Replication is
@@ -17,8 +17,8 @@ Replication is pull-based. This means that replication is driven by the
1717follower index. This simplifies state management on the leader index and means
1818that {ccr} does not interfere with indexing on the leader index.
1919
20- [float]
21- === Configuring replication
20+
21+ ==== Configuring replication
2222
2323Replication can be configured in two ways:
2424
@@ -65,8 +65,8 @@ POST /follower_index/_ccr/pause_follow
6565
6666//////////////////////////
6767
68- [float]
69- === The mechanics of replication
68+
69+ ==== The mechanics of replication
7070
7171While replication is managed at the index level, replication is performed at the
7272shard level. When a follower index is created, it is automatically
@@ -128,17 +128,17 @@ closing itself, applying the settings update, and then re-opening itself. The
128128follower index will be unavailable for reads and not replicating writes
129129during this cycle.
130130
131- [float]
132- === Inspecting the progress of replication
131+
132+ ==== Inspecting the progress of replication
133133
134134You can inspect the progress of replication at the shard level with the
135135{ref}/ccr-get-follow-stats.html[get follower stats API]. This API gives you
136136insight into the read and writes managed by the follower shard task. It also
137137reports read exceptions that can be retried and fatal exceptions that require
138138user intervention.
139139
140- [float]
141- === Pausing and resuming replication
140+
141+ ==== Pausing and resuming replication
142142
143143You can pause replication with the
144144{ref}/ccr-post-pause-follow.html[pause follower API] and then later resume
@@ -147,8 +147,8 @@ Using these APIs in tandem enables you to adjust the read and write parameters
147147on the follower shard task if your initial configuration is not suitable for
148148your use case.
149149
150- [float]
151- === Leader index retaining operations for replication
150+
151+ ==== Leader index retaining operations for replication
152152
153153If the follower is unable to replicate operations from a leader for a period of
154154time, the following process can fail due to the leader lacking a complete history
@@ -178,8 +178,8 @@ the lease expires. It is valuable to have monitoring in place to detect a follow
178178replication issue prior to the lease expiring so that the problem can be remedied
179179before the follower falls fatally behind.
180180
181- [float]
182- === Remedying a follower that has fallen behind
181+
182+ ==== Remedying a follower that has fallen behind
183183
184184If a follower falls sufficiently behind a leader that it can no longer replicate
185185operations this can be detected in {kib} or by using the
@@ -208,8 +208,8 @@ segment files are deleted on the follower cluster. The
208208files from the leader again. After the follower index initializes, the
209209following process starts again.
210210
211- [float]
212- === Terminating replication
211+
212+ ==== Terminating replication
213213
214214You can terminate replication with the
215215{ref}/ccr-post-unfollow.html[unfollow API]. This API converts a follower index
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